So, I'm turning on my iPhone 5S to set up, and as I enter in my Apple ID and password to restore from iCloud backup, it asks me to choose my backup. So I choose it, but then it asks me to enter the password of my Apple ID for purchases on the iTunes Store. The problem is that, on this screen, the Apple ID (e-mail address) changes to an incredibly old one that I haven't used in years. Thus, when I try to enter my password in, it keeps rejecting it. Setting a new password, nothing accepts it. It's really weird, because I've never had this issue before. In fact, just last week, I did a restore on my iPad, and this didn't appear at all. Does anyone know what's causing this and how to fix this? I'd really love to start using this phone. Thanks!