IPhone photo background

I have the iPhone 4S but I'm pretty sure it doesn't make a difference, whenever I try to make one of my photos from my camera roll my background either for home or lock screen, it completely zooms in the picture and makes it not able to fit the entire thing. I can't set my photo background if it keeps zooming in on it and I can't zoom out to fit it so I'm not sure if I enabled some sort of setting without realizing or if it's just supposed to be like that. If someone knows how to fix that problem or if it's supposed to be like that let me know please

I have heard of this happening on many occasions and I'm sure it's more of the phone itself at error. If you haven't ruined the phone in anyway except from the actual device that is at fault you should be able to return it to wherever you got it as you did not break it and it was a system error and get a new one or get it fixed.