I was just looking at the users list (specifically rep in the last month) and then looked at a couple of user profiles. These users have 500+ rep even though it says they have 0 questions and 0 answers:
- https://webmasters.stackexchange.com/users/9607/alan-h
- https://webmasters.stackexchange.com/users/10172/rook
They do have several badges that imply they have asked or answered questions. I'm assuming a bug with question display?