Thanks for the credentials. I logged into your site and your configuration in JFBConnect and the Joomla backend looks fine. I think the problem lies in how your Google application is set up. I created a test application of my own for your site and replaced the Google App ID and Secret Key in the JFBConnect backend temporarily with my test app's values. With this app, I was able to successfully be brought to the login / registration page and create a user with my Google credentials with no issues.
I put the following values in my redirect URIs in the application
http://tierboskloof.ironcloud.co.za/index.php?option=com_jfbconnect&task=authenticate.callback&provider=google
https://tierboskloof.ironcloud.co.za/index.php?option=com_jfbconnect&task=authenticate.callback&provider=google
While the values in your screenshot look ok, please double-check that you don't have any spaces in the URI and try re-typing it in without copy/paste. If that doesn't work, I'd suggest deleting your application and create a new one using our Google Application Setup Guide at
www.sourcecoast.com/jfbconnect/docs/soci...le-application-setup - as I said with a brand new app that I created, Google authentication on your site worked just fine.
[Edited to add] By the way, I left my user on the system so that you could see it was created properly in the Joomla Users Manager area and there is a corresponding correct mapping in the JFBConnect > User Map area for the Google network.
-Melissa