The "administrators" and "Administrators" group both are the same group. In your case, it's supposed to be hidden, but is not. Can you look in your redis and ensure that when you run hgetall gid:1 and hgetall gid:2 (which should correspond to the "Registered Users" group and the "Administrators" group), that hidden is set to 1?
Group Title Change
On master the group title setting has moved from the settings page to the profile edit page. In the database the
groupTitleproperty is in the user hash
(user:1)now instead of the user settings hash(
If you have a custom theme that has a custom edit/settings page you can apply this change