From your picture, I believe you're correct about the email address being imported properly. If it wasn't, JFBConnect would detect that automatically and show the email field for the user to fill out. Since the email field isn't showing, it means that the the email is likely being imported.
With that said, can you double check the "Enable Automatic Registration" setting. The "Yes" option is *red*, which is a bug and different than all the other fields. So, some users look and think the setting is on, even though it says "No".
If it definitely is on, we'll have to investigate further. We'll need to investigate further. Can you Private Message admin credentials for your site, and we'll gladly look into what's happening.
Thanks,
Alex