the app is semi translucent. its your wallpaper showing through slightly, like the second poster said. look at the screen in the app, then close it. you will see where its your wallpaper showing.
im sure they are talking about the blurred image in the middle of the screen, which is the wallpaper showing through. i checked the app on my phone too and it does the same thing. im surprised the OP didnt realize their own wallpaper image matched the outline of the blurred image. its the first thing i realized when i opened the updated app for the first time. OP, post a screen shot of your home screen. it looks like its a pic of a persons face and shoulders.
This is not light bleeding which would be a hardware issue. Taking a screenshot on your phone won't capture faults like light bleeding or dead pixels because they aren't software issues.
What you're seeing is probably your wallpaper through the translucent menu.
You get the same effect when you exit the camera app. Look at the minimised image and it's a translucent image of your last picture. Nothing wrong with your screen.