IPhone 6s running on iPhone 5s settings?

IPhone 6s running on iPhone 5s settings?

Added (1). I recently got an iPhone 6 and the mobile guy told me to use my iPhone 5s backup to get my info on the 6. I did just that, and I realized that it made the phone go into the 5s settings. So far, I've noticed that Siri does not have it's own category in settings, and the letters on the right in the contacts, music, etc., are small and bunched up together. Before backing up the device, it was working just fine. How do you fix this? I've tried factory resetting and everything, but it doesn't work!

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