I saw these issues noted by others earlier in this post, but I am surprised that there has been no response. When using "Sign up", after 3rd-party authorization, the login form returns BLANK input fields. Only when using "Login" will the input fields be populated correctly. This is of course not acceptable, since any new user will attempt to "sign up" if they are not yet registered user. Screenshots for clarity:
Click "Sign up":
After successful authorization by any provider, form inputs are empty:
Click "Login":
After successful authorization by any provider, form inputs are populated correctly:
So this is kinda useless of course. Any new user will attempt to sign up with "sign up" and not "login", and the resulting screen will cause fail.