4.x you no longer have forum posts on profile here in forum. insted its called content count where its a combined posts of forum posts, file review, file comments, file uploads, status post, status comment, blog comments, blog submission, calendar submission etc.
What i suggest was that you seperate forum posts from content count so we have forum post count again on forum. so when user see their profile or user profile from topic left side they see content count and forum posts