Joomla system is unable to register new user using jfbconnect

Hello,

I have a joomla 3.5.1 system with jfbconnect configured default.
The issue is : On login page(joomla default) jfbconnect configured facebook and twitter buttons are coming when i click on facebook button it shows me facebook popup to fill username and password of facebook.

After filling all when i click login the page gets refresh but it stays unchanged, whereas it should redirect me to user profile page.

when i checked it for user is logged in or not by clicking login menu again, it should show me logout, but it shows me default login with user and password fields.

i checked my database and in admin the manage user menu, unfortunately i didnt find any new user which recently tried to login with facebook credentials.

and in the new tab in same browser when i opened the facebook, it was already logged in, means javascript facebook login is working fine, but joomla system is not allowing user to get in(login).

as per my knowledge.

Please help me as soon as possible.

Thanks.