Leigh,
First, just so you know, JFBConnect v6.2.2 is out now. There's quite a few improvements in the 6.2.x series, from new features to performance. It should be a one-click upgrade and is definitely recommended, but not required.
As to your issue, I'm not sure what would be bringing the user to the Joomla registration page. Just to double-check, are you positive it is actually the Joomla registration page? I'd recommend turning off SEF URLs and then checking the address bar. If the registration page has option=com_users, then yes, it's the Joomla registration page. If it has option=com_jfbconnect, then that's our page. By default, we use the JFBConnect registration page. Unless you have the Social Profiles - Joomla plugin enabled *and* have selected the Registration Component to be "Joomla", what you describe should not be happening.
If it is though, can you PM me admin access to your site so we can put it online temporarily and test further?
For the Terms of Service, I'm not sure what profile extension you're using, but this should be possible. The standard User - Profile plugin that comes with Joomla has a T&C check, which can be set to show on the JFBConnect or Joomla registration flows, and that may be all you need to use.
I hope that helps,
Alex