I had to change my email address associated with my account and my post count now shows zero.
Clinton
Edited to add: And 1 after this post.
David Ladiges, the web developer who is responsible for fixes to the forum (among other things), is aware of this bug and it's on his long to do list, however he has other priorities right now. If you'd like to recover your post count, drop him a note by posting a comment on his forum profile (it will go to his email) and he'll fix it in this instance. Eventually perhaps he'll find that it'll take less time to just fix the bug than to restore each person's post count who requests it when they change email addresses.