These kind of thoughts are normal, but can develope into a subform of ocd called pure-o ocd

One of the very few at least. Around 90% of people have these kind of thoughts from time to time.

Besides that I also feel like it has to do with the way lemmy gets new content from other server. I’ve noticed a downpour of post from the same sub on the new feed happening all at once several times now. With some of the posts already being several hours old.