Old closed forum posts gone?

EDIT: Looks like it may have been some kind of intermittent issue, it all went back to normal after a few hours.

I noticed that the old (and maybe closed) forum posts have completely disappeared from my community server's forum channels. They used to all be available under the Older Posts section, but now they aren't. I hope this is a bug and they'll come back once it is resolved, because I was relying on information from some of those old posts, because the forum feature doesn't say anything about deleting posts, and because that's a very unexpected behavior, considering that threads don't just disappear like that.