Prestahop login button can only work after we logged in manually

[elmtreecomputers]

I tried to login FB and Google Account during registration and login.
It always just go to authentication to always come back and refresh the same page.

But once I logged in using existing user account, Social Login allows me to log in for the same user.
However after logging out and logging in using another user, the Social Login just keeps refreshing the same page again.

Is there anything I should modify?

Steps to reproduce :

Go to my site: www.allgoodjourney.com.au

And go to registration / login page with your existing user account, you will see what I meant.