Hi, I think its not on the number of post but the quality of the post you make. In local forums they start deleting zero value posts and posts that is not related to Bitcoin. You can check the the Newbies read before posting. Maybe some of your post were deleted or not counted. Quality over quantity. Good luck to us. 
If any of my posts were deleted, so it would be shown less number of made posts in my profile. And the quality of posts is good. I usually post in Bitcoin discussion, Altcoin discussion, Economy and Services threads. And the posts are not short.