All members became admin

Need Some help here....i don't know what is going on...but all of my members now have admin privilage.

I already check the database, but there are no sign that they assigned to have admin privilage...

FYI, i just implemented Facebook connect plugins, all members who sign in using this, suddenly have admin privilage.

I tried to login without facebook connect, my new member register manually, but i this user still have admin privilage...

does anybody know, how to setting this privilage?