Tangentially, some of those comments are at 0 karma, and are still on that list. This doesn't make much sense to me, but honestly I've never looked at that feature before, and probably will continue not to.

I had only looked at the first couple screenfuls of the list when replying to you, and most comments were from this thread and upvoted quite a bit. Anyway, the thing does occasionally misplace comments (e.g. heavily downvoted comments mysteriously in the middle of it), though I think that when there are lots of zero-karma comments at the bottom there really aren't any more upvoted comments from the last 24 hours.