When I plug headphones into my iPhone 5, the home button will not work. It switches functions to the button on the headphones only. Is that normal with the latest ios version? I just updated a brand new replacement phone.

I picked up a replacement phone today. After restoring the new iPhone from an iTunes backup, I noticed that the new phone doesn't let me use the front "Home" button on the phone if the iPhone 5 headphones are plugged into it. When plugged in the headphone button becomes the only "Home" button. I don't remember it that way on the iPhone 5 I just had. Is this the functioality I should be expecting?