Invisible posts?

I thought that I’d seen this happen before, but couldn’t nail it down. Now I’ve found a thread that has “disappeared”:

Minority Report questions (spoilers)

If you do a search on the above thread, it shows as last post from pldennison on 6/28 at 11:28 am. But my post (on 6/30 at 9:20 pm) is in the thread.

But if you go through Cafe Society pages the thread does not show in the list at the most recent post time, it’s stuck at 11:28 am. I considered bumping it again to see if that would move it up but didn’t want to mess with it in case this is a bug in your software. I noticed this because there is now a new thread with questions on Minority Report.

FAQ - technical issues - please read this BEFORE posting a question