That's odd. I really would think you would have more posts than that, but I can't think of any reason why your post count wouldn't show all your posts. We never delete posts, so it's not like they can just disappear.
I know, right? beka has the same issue - she's only showing just over 3000 all of the sudden. Not that it matters, just weird. I probably posted more than that just in the Nothing Interesting thread!