bbPress.org

Can you link to the site so I can see everything that is happening for the user profiles?

Try bulk editing a user in Users > All Users, and give them a forum role if they do not seem to have the default bbPress roles and see if that fixes anything.

Are you importing from another WordPress/bbPress site?

I also think how you imported everything could be a possibility of why the profiles are screwed up.

I guess you could hide the profiles but the profile links would link to nothing.