Will get notifications of comments and videos that then vanish (iOS, minor)

I don’t know if this is an issue of comments being deleted by the user, but I’ll get a comment notification and when I click on the app, it’s disappeared. It’s happened with both comments and replies (in other videos) and with new users/harassing comments and older viewers and/or not harassing comments.

Similarly, some bell notifications will vanish and be posted again a little later. I dunno if that’s because people are deleting their own posts or what.

Thank you.