why "C# Cornor app" not login while web login?

Question

When I first time know about this site then I use my Gmail id to directly login but when I download c# cornor app downloaded into the play store using this site link when open this app login my same Gmail id but it open a new account where my previous working not found, no bio, no certificate means its created my new id, so my question is that there is any bug in-app or its fake?

 

if not then how can I safely login/logout to my account using the android application and web application?

It can be solved or not admin sir please give me a solution.