The App keeps asking for permission to “Have offline access”, why?

Question

After having authorized the app with oAuth2 and acquiring permissions for requested scopes, I still get a screen asking if I grant the app permission to Have offline

Answer 1

Most probably this is very normal according to the incremental auth mechanism and its design, The idea is if a user has already granted the permissions to an app, there is no need to show the same permissions and ask the user to approve.

http://googleplusplatform.blogspot.com/2013/12/google-sign-in-improvements11.html