I just tried your site again. When I click the Facebook login button, I'm brought to the JomSocial registration page with my username, name and email address pre-filled for me. I didn't try to go through the full process, but that's what I'd expect when JFBConnect is working and configured with Auto-Registration *disabled*.
Earlier today, I was being brought to the page I noted above. Something changed between then and now, and I haven't made any configuration changes on your system.
Can you verify if the registration process works with JomSocial as expected?
Thanks,
Alex