I've started noticing this about a week or so ago. I've yet to get a consistent repro - but it seems to occur after editing a topic (as TL3 here on Meta, or Moderator at Stonehearth).
Here's what I've been seeing:
On a topic that can scroll, moving down (go to a later post) then back up resolves it. On a topic without scroll, I have to refresh the page to resolve it.
Has anyone else seen this?
Edit: just made a ninja edit to fix a typo, got the bug in this very topic!
Edit 2: And it happened again after the edit to add the image. Perhaps repro is being scrolled to topic of topic when making an edit...