The first problem is that some posts simply don't appear, not even when searching for them. For example:

https://poliversity.it/@skariko/115378312894874276 if I search for it on citiverse.it it doesn't appear, whereas if I search for it here on community.nodebb.org it appears regularly.

From my server I receive it like this:

curl -s -H "Accept: application/activity+json" https://poliversity.it/@skariko/115378312894874276 | python3 -m json.tool
{
    "@context": [
        "https://www.w3.org/ns/activitystreams",
        {
            "ostatus": "http://ostatus.org#",
            "atomUri": "ostatus:atomUri",
            "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
            "conversation": "ostatus:conversation",
            "sensitive": "as:sensitive",
            "toot": "http://joinmastodon.org/ns#",
            "votersCount": "toot:votersCount",
            "litepub": "http://litepub.social/ns#",
            "directMessage": "litepub:directMessage",
            "blurhash": "toot:blurhash",
            "focalPoint": {
                "@container": "@list",
                "@id": "toot:focalPoint"
            }
        }
    ],
    "id": "https://poliversity.it/users/skariko/statuses/115378312894874276",
    "type": "Note",
    "summary": null,
    "inReplyTo": null,
    "published": "2025-10-15T13:02:18Z",
    "url": "https://poliversity.it/@skariko/115378312894874276",
    "attributedTo": "https://poliversity.it/users/skariko",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://poliversity.it/users/skariko/followers",
        "https://feddit.it/c/informatica",
        "https://feddit.it/c/informatica/followers"
    ],
    "sensitive": false,
    "atomUri": "https://poliversity.it/users/skariko/statuses/115378312894874276",
    "inReplyToAtomUri": null,
    "conversation": "tag:poliversity.it,2025-10-15:objectId=9243092:objectType=Conversation",
    "content": "<p>Il vostro amore per Tor sar\u00e0 raddoppiato!</p><p><span class="\&quot;h-card\&quot;" translate="\&quot;no\&quot;"><a href="\&quot;https://feddit.it/c/informatica\&quot;" class="\&quot;u-url" rel="\&quot;nofollow" target="\&quot;_blank\&quot;">@<span>informatica</span></a></span> </p><p>Come (quasi) tutti gli anni \u00e8 possibile fare una <a href="\&quot;https://donate.torproject.org/\&quot;" target="\&quot;_blank\&quot;" rel="\">donazione a Tor</a> che verr\u00e0 raddoppiata da <a href="\&quot;https://powerupprivacy.com/\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;nofollow">alcuni supporter speciali</a>.</p><p>In                                            sostanza se voi donate 25\u20ac alcuni supporter raddoppiare la donazione donando a loro volta altri 25\u20ac e lo faranno fino a un totale 250.000\u20ac!</p><p>Se avevate intenzione dunque di                                            fare una donazione \u00e8 probabilmente questo il periodo migliore. E, in base a quanto donerete, potrete ricevere a casa anche alcuni regali come adesivi, magliette, cappellini o felpe. \ud83d\                                           udc9c</p><p><a href="\&quot;https://blog.torproject.org/2025-fundraiser-donations-matched/\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;nofollow" translate="\&quot;no\&quot;"><span class="\&quot;invisible\&quot;">https://</span><span class="\&quot;ellipsis\&quot;">blog.torproject.org/2025-fundr</span><span class="\&quot;invisible\&quot;">aiser-donations-matched/</span></a></p>",
    "contentMap": {
        "it": "<p>Il vostro amore per Tor sar\u00e0 raddoppiato!</p><p><span class="\&quot;h-card\&quot;" translate="\&quot;no\&quot;"><a href="\&quot;https://feddit.it/c/informatica\&quot;" class="\&quot;u-url" rel="\&quot;nofollow" target="\&quot;_blank\&quot;">@<span>informatica</span></a></span> </p><p>Come (quasi) tutti gli anni \u00e8 possibile fare una <a href="\&quot;https://donate.torproject.org/\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;">donazione a Tor</a> che verr\u00e0 raddoppiata da <a href="\&quot;https://powerupprivacy.com/\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;nofollow">alcuni supporter speciali</a>.</p><p>In                                            sostanza se voi donate 25\u20ac alcuni supporter raddoppiare la donazione donando a loro volta altri 25\u20ac e lo faranno fino a un totale 250.000\u20ac!</p><p>Se avevate intenzione dunque di f                                           are una donazione \u00e8 probabilmente questo il periodo migliore. E, in base a quanto donerete, potrete ricevere a casa anche alcuni regali come adesivi, magliette, cappellini o felpe. \ud83d\u                                           dc9c</p><p><a href="\&quot;https://blog.torproject.org/2025-fundraiser-donations-matched/\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;nofollow" translate="\&quot;no\&quot;"><span class="\&quot;invisible\&quot;">https://</span><span class="\&quot;ellipsis\&quot;">blog.torproject.org/2025-fundr</span><span class="\&quot;invisible\&quot;">aiser-donations-matched/</span></a></p>"
    },
    "updated": "2025-10-15T13:05:15Z",
    "attachment": [
        {
            "type": "Document",
            "mediaType": "image/png",
            "url": "https://s3.poliversity.it/media_attachments/files/115/378/301/124/619/993/original/73832f78ae58b0d0.png",
            "name": "Un'immagine con uno sfondo scuro che presenta il testo \"Free the Internet\" in carattere pixelato. Al centro c'\u00e8 un simbolo di una catena spezzata, circondato da un el                                           emento grafico a stella, con colori vivaci viola e verde.",
            "blurhash": "U86bDUof01RjWUa#jcocD%ay-;ofxuoeR%Rl",
            "focalPoint": [
                0.0,
                0.0
            ],
            "width": 940,
            "height": 529
        }
    ],
    "tag": [
        {
            "type": "Mention",
            "href": "https://feddit.it/c/informatica",
            "name": "[informatica@feddit.it](https://community.nodebb.org/category/informatica@feddit.it)"
        }
    ],
    "replies": {
        "id": "https://poliversity.it/users/skariko/statuses/115378312894874276/replies",
        "type": "Collection",
        "first": {
            "type": "CollectionPage",
            "next": "https://poliversity.it/users/skariko/statuses/115378312894874276/replies?only_other_accounts=true&amp;page=true",
            "partOf": "https://poliversity.it/users/skariko/statuses/115378312894874276/replies",
            "items": []
        }
    },
    "likes": {
        "id": "https://poliversity.it/users/skariko/statuses/115378312894874276/likes",
        "type": "Collection",
        "totalItems": 0
    },
    "shares": {
        "id": "https://poliversity.it/users/skariko/statuses/115378312894874276/shares",
        "type": "Collection",
        "totalItems": 1
    }
}

The second problem, which I don't know if it's connected to this or not, is that now topics coming from Mastodon have a strange code in the subject, meaning they contain 'n and everything is inserted into the title.

Example:
This post on Mastodon https://poliversity.it/@trapiantodipelo/115377451751168706 appears on Citiverse in this way, with an unreadable title: https://citiverse.it/topic/ca60c417-ab8e-4b64-84f3-e8c9e158ddaf/trovati-i-resti-della-terra-primordiale-n@scienza-hashtag-n-n-risalgono-a-4-5-miliardi-di-anni-fa-riconosciuti-dalla-firma-chimica-nelle-rocce-n

Remains of primordial Earth found'n@scienza (HASHTAG)'n'n They date back 4.5 billion years, recognised by the chemical signature in the rocks'n

Even in this case, I read it from the server like this:

curl -s -H "Accept: application/activity+json" https://poliversity.it/@trapiantodipelo/115377451751168706 | python3 -m json.tool
{
    "@context": [
        "https://www.w3.org/ns/activitystreams",
        {
            "ostatus": "http://ostatus.org#",
            "atomUri": "ostatus:atomUri",
            "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
            "conversation": "ostatus:conversation",
            "sensitive": "as:sensitive",
            "toot": "http://joinmastodon.org/ns#",
            "votersCount": "toot:votersCount",
            "litepub": "http://litepub.social/ns#",
            "directMessage": "litepub:directMessage"
        }
    ],
    "id": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706",
    "type": "Note",
    "summary": null,
    "inReplyTo": null,
    "published": "2025-10-15T09:23:18Z",
    "url": "https://poliversity.it/@trapiantodipelo/115377451751168706",
    "attributedTo": "https://poliversity.it/users/trapiantodipelo",
    "to": [
        "https://www.w3.org/ns/activitystreams#Public"
    ],
    "cc": [
        "https://poliversity.it/users/trapiantodipelo/followers",
        "https://feddit.it/c/scienza",
        "https://feddit.it/c/scienza/followers"
    ],
    "sensitive": false,
    "atomUri": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706",
    "inReplyToAtomUri": null,
    "conversation": "tag:poliversity.it,2025-10-15:objectId=9239465:objectType=Conversation",
    "content": "<p><a href="\&quot;https://www.ansa.it/canale_scienza/notizie/terra_poli/2025/10/15/trovati-i-resti-della-terra-primordiale_81669da1-314e-4e50-856b-8aa51bd85138.html\&quot;" target="\&quot;_blank\" rel="\&quot;nofollow">Trovati i resti della Terra primordiale</a></p><p><span class="\&quot;h-card\&quot;" translate="\&quot;no\&quot;"><a href="\&quot;https://feddit.it/c/scienza\&quot;" class="\&quot;u-url" rel="\&quot;nofoll" target="\&quot;_blank\&quot;">@<span>scienza</span></a></span> (HASHTAG)</p><blockquote><p>Risalgono a 4,5 miliardi di anni fa,  riconosciuti dalla firma chimica nelle rocce</p></blockquote>",
    "contentMap": {
        "it": "<p><a href="\&quot;https://www.ansa.it/canale_scienza/notizie/terra_poli/2025/10/15/trovati-i-resti-della-terra-primordiale_81669da1-314e-4e50-856b-8aa51bd85138.html\&quot;" target="\&quot;_blank\&quot;" rel="\&quot;nofollow">Trovati i resti della Terra primordiale</a></p><p><span class="\&quot;h-card\&quot;" translate="\&quot;no\&quot;"><a href="\&quot;https://feddit.it/c/scienza\&quot;" class="\&quot;u-url" rel="\&quot;nofollo" target="\&quot;_blank\&quot;">@<span>scienza</span></a></span> (HASHTAG)</p><blockquote><p>Risalgono a 4,5 miliardi di anni fa,  riconosciuti dalla firma chimica nelle rocce</p></blockquote>"
    },
    "attachment": [],
    "tag": [
        {
            "type": "Mention",
            "href": "https://feddit.it/c/scienza",
            "name": "[scienza@feddit.it](https://community.nodebb.org/category/scienza@feddit.it)"
        }
    ],
    "replies": {
        "id": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706/replies",
        "type": "Collection",
        "first": {
            "type": "CollectionPage",
            "next": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706/replies?only_other_accounts=true&amp;page=true",
            "partOf": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706/replies",
            "items": []
        }
    },
    "likes": {
        "id": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706/likes",
        "type": "Collection",
        "totalItems": 0
    },
    "shares": {
        "id": "https://poliversity.it/users/trapiantodipelo/statuses/115377451751168706/shares",
        "type": "Collection",
        "totalItems": 1
    }
}

Does this only happen to me or is it a common problem? How could it be solved?