I went to update an App in iOS 8 and after rejecting my password a few times I noticed that the ID was my gf's email address, but when I went to the bottom of the 'Featured' section it showed me signed in, so I signed out and resigned in again but that did not help. So I went to the iTunes store also in iOS 8 and I was also signed into that so again I signed out and signed in but still when I went back to the App store my gf's email address was in there. It just asks me for my password, the account is already set and I can't change it. What is going on here? Any help appreciated.