For a rather dull reason, I ran an update script yesterday that re-calculated everyone's post counts to reflect the actual number of posts currently live on the site.
So, if you'd previously posted on a thread which was subsequently deleted taking your post(s) with it, your post count would have been higher than the actual number of posts that remained.
Now, it will be accurate again and will increment by one each time you submit a new post.
@PPF in single figures then ?