Rear camera taking upper part of picture blurry.

Hi, so i've read about lots of people having issues with blurry pictures on iphone, it had never happened to me, i had an iphone 6 and and it was fine, now i just changed to a 7 plus, but now the top part of every picture i take no matter how close or far is blurry out of focus and low definition grainy.

What should i do? i've tried tapping the camera area in different ways, closing the camera app, restarting the phone, locking the focus, but none of this has helped.

Thanks.