the admin panel has a nifty little button called "update user´s post counts". if someone pushes it it recount all posts a user (users) has made. for those who signed up after LF merged as one forum, there is no problem. but for those who were at the forums before the merge it has a slight problem. all posts in those seperate forums arent counted when that button is pressed. so when you for example had 2000 posts in those old forums and the update post count button is pressed, those 2000 posts arent counted which resolves in a loss of 2000 in your post count.