Placement of the Google and Facebook buttons are mismatched.
Email id field should not be shown on sign up screen if user tries to sign up with fb or Google
User can not create an account with Facebook and Google
For Facebook- if user taps on Sign up with Facebook, all the mandatory fields are automatically filled with data after getting permissions while for Google it's not the same case.
Multiple taps are enabled for the app as user can tap on both Google and Facebook button at the same time and both popup appears on one another.
Login Screen : There should be no space between “Username” .