JFBConnect shouldn't be modifying the JomSocial HelloMe module or the standard Joomla module.
If you want to test without JFBConnect, you can disable the JFBCSystem plugin. That shuts off almost all functions of JFBConnect. If you still have the problem then, it's not related to JFBConnect.
Beyond that, I would recommend disabling SEF URLs and see if that corrects the problem. If so, that may be a good clue as to where the problem is.
Thanks,
Alex