I create a new user on my site. Then I connect my site user profile with my facebook account. Then I log off. But when I sign on again, the imported settings didn't save from before. Why would this happen?
I don't know. So when you log in, and go to the JomSocial page, the fields are there and populated? Which account are you logging back in with (FB or Joomla)? If FB, can you check if the Joomla username that it logs you in with both times (first registration, and login) are the same?