Would this have anything to do with it?
I was testing user settings when I first installed simple press, I had changed the default number of unread posts to 200 and allowed the members to set their max number of unread posts.
I did not mention anything to the members, but adjusted it on my test account, I wanted to see if it would slow down the queries, how quickly 200 posts would take to propagate, etc. I decided to change it back to 50 and allow them to set their max , but my test account kept filling to 200 posts, I didn’t think anything of it, I just cleared the posts and cleared the cache,
I logged into that account and saw that it was still showing 200 unread posts, so I looked around the settings more and saw the new posts topic cache was set to 200 under global settings, so I changed that to 100 and cleared all the caches, then changed it back to 200.
Is it basically waiting to build the cache back to 200 before the new topics kick in and start propagating those areas?