I have it on 2 sites with fairly identical setups. Exact same behavior.   I have also noticed that if I make a change to a setting under email or push (Studio > Notification) on the 2nd page of either notification type, the setting is changed for both email and push.  This behavior does not occur on the first page of settings.  Disabling and enabling - clear cache - turning off cache - has no effect. Nothing specific about my server is going to be causing that.  On a 3rd site - where I have never installed pro and so only have 1 page of notification settings - everything works fine.