See e.g. https://piefed.social/communities?search=forward - there are 2 communities listed there, both go to the same place if you click them, and that place has no posts from the last 3 days.
It almost looks like the existence of the second version of that community - changed mere seconds ago at the time of my writing this, except again, when you click the link it doesn’t show anything new for several days - is soaking up all the new posts, but since it is inaccessible by the normal means those new entities cannot be accessed.
This is my favorite spot in the Fediverse, so I hope it is addressed soon! That community in particular is doing great work to make the Fediverse fun & welcoming to come to by all us nerds:-).
I’ve noticed the same happening sometimes on https://feddit.online. I deleted one of the duplicates to fix it. I assumed it would fix it, but based on this report, the community might be left broken.
I have a hunch, but don’t have evidence, that it’s possible to add a community that was already added by the seeding routine and so end up with two of the same.
Oddly, they do have different stats.
Yeah and 92 posts from a single community (for the 2nd one, updated more recently) does seem excessive, but then again there has been a HUGE flurry of daily posts there (https://lemmy.world/c/tenforward) these last few days so… actually fairly believable. Especially if edits to a posts’ content count towards that stat (I have no idea, just throwing that out there:-).
Though it is also strange that the 1st community is shown as having been updated a few hours ago. Except… those don’t show up, at !tenforward@lemmy.world? So maybe those updates are for comments/votes for the older posts, while somehow the newer posts are being slurped into the 2nd community, which then hides them from the end-user’s view.
Anyway I don’t know how to take this further to diagnose, but I hoped that bringing it to your attention could be of at least some use!:-)