Ah, I thought I was going crazy when I noticed
This Thread is listed in the OTBBA forum list as having three replies when it only in fact has two. Perhaps someone tried to post something by mobile and the post didn't show up but it still counted in the number of replies.
This thread is having the same issue, saying 13 replies in the list (before I posted this one) and only 10 replies appearing (again, before mine).