"New Threads" observation

It's no big deal, but wondered if anyone else mentioned an issue.

There are occasions, that when I hit "new Threads" at the top of the screen that the lists DON'T update.  It will have a post that's 30 minutes old at the top (which is supposed to be the most recent).  But if you go into the actual forum, there will be dozens of more recent posts.

Also, there are times that MY thread won't even make the list under "new threads" even if it's getting a lot of action.  But I will see it in the actual forum.

make sense?  Again, not a big issue, but wondered if it could be my machine (need to clear a cache or something) or something on your end.