Posts in the Coffee Lounge don't count towards your displayed post count. There's a long and sometimes painful history to this.
The concise version is that we wanted to encourage participation in the smallholding boards, back when we displayed the post count on every post, and displayed member groups. Basically the more posts you made the more 'advanced' your group, up to Super Hero Member. We felt that as a smallholding forum it was right to 'reward' contributions to the subejct forums above things like the word association game, where the post count racked up very quickly.
Thankfully that's all pretty much redundant now, since the only place your post count and member group is shown is on your profile page.
Maybe we should include Coffee Lounge posts in the count though, can't see any reason why not and it might help to avoid a domestic.