App returning back to initial view automatically and instant

I have created an app ( for mobile ). It is working fine on android and IOS. But when I want to test the app with Web preview, after login It automatically returns me back to the login screen back.

On the URL I can see the page changes from login to profile page and then after 1 second it brings me back to the login screen again. Please help.

Application id: 196163

Is there anyone who can see into this problem? @appgyver team does not reply to my any new threads. What is going on?