You likely have an SEF extension enabled that is altering our URLs. Please configure your SEF extension to 'skip' altering URLs for JFBConnect or test with SEF turned off altogether.
If that doesn't help, I'd suggest following our
Google Application Setup Guide
to verify that your redirect URI's are set up correctly, specifically step 7.b.vi.
Also, in trying to test this on your site, I attempted to authenticate with Google and was brought to a page that says "me" only. I am not sure if you're debugging this or not, but I'm not seeing the behavior you're describing.
-Melissa