The problem is how jQuery is loading on your site. It seems some optimization is making the jQuery file load at the very bottom of the page right before the closing body tag. However, the JFBConnect Javascript file, which loads in the head, needs to have jQuery loaded before it is loaded.
Either fix the jQuery file inclusion location or enable the "Include jQuery / Bootstrap" setting in JFBConnect to include our special jQuery and Bootstrap javascript file.
I hope that helps,
Alex