Are you talking about posts or threads? And are you talking about the counter on the bottom of the index page or in the forumdisplay pages? And if it is posts, can you actually find a thread that used to have 100 posts and now has 50 (or whatever)? And have these posts actually disappeared or are they soft deleted or are they still there when you open the thread? And are people's post counts changing also? And how about in the posts table... can you see that one day there are 39000 entries and the next day only 38500? And do you notice if they disappear randomly or is it by date?