Diego,
Your correct. I hadn't realized that before, so thanks for pointing it out.
The Reconnect feature lets a user who's logged into Joomla, but not into Facebook, to 'connect' their accounts. Doing a connection for an already logged in user does allow a user with a different Facebook email address to the Joomla user regardless of email address in Joomla.
If you don't want that feature, it can be disabled in the SCLogin parameters under "Allow Reconnections" or something like that. To fix the button, you can edit the /modules/mod_sclogin/helper.php file. Around line 302, you'll see:
$buttonHtml .= '<fb:login-button v="2" onlogin="javascript:jfbc.login.login_button_click();">' . JText::_('MOD_SCLOGIN_CONNECT_BUTTON') .'</fb:login-button>';Simply copy the portion of the line after "echo" that you un-commented from the login.php file into the right side of the line above, and you should be good to go.
Hope that helps, and sorry for the trouble!
Alex