frozen active and hot sort?

I noticed that when I sort by active or hot, it looks like the results have been staying completely the same for a past week or so, even when new posts are being made and getting comments and votes. Even on the "all" page, active and hot appear to be stuck. I checked a few other Lemmy instances, and their active and hot sorts seem to be fine, so I don't think it's a bug in the software.