No, it looks like what is happening is someone has registered with wordpress, voted once in the q2a forum, then unregistered, leaving a record of their points in ^userpoints. Six of the users just had one vote. A seventh user actually had some posts, but there was no record of the user in my wordpress install. I guess the problem is the q2a doesn't know when someone has left Wordpress. It should have a check before including a user in the user list. Removing the entries from ^userpoints gets rid of the users.