S7 edge possible defect question

I just got my second silver s7 edge since my first one had a horrible battery life.

After getting this one and looking in bright light where the phone shines, I notice at the top of the phone under the glass on the edge of the silver foil stuff, it has a wrinkled look across the whole top.

I don't notice it on the bottom which seems to be the same exact dimensions, and also don't notice it on the back.

I tried to take a picture but the picture is very hard to pick up on camera and looks a lot worse in person.

I want to make sure this is normal or not because I didn't remember seeing it on my other s7 edge

Thanks