Ghost letters and app display

I was looking at some picture that had mainly white background and noticed that there is a certain ghost screen that was layered on top of it. I edited a picture to try to bring out as much as possible. From what I can actually see on the phone, it looks like the image of a whatsapp conversation as i can see the letters at the bottom of the screen as well as the typing bar with the camera on the side and the go back button in top left. I tried to take screenshot but it doesn't show on the screenshot. Could it be the screen burning up? In terms of actual color its between a brown / orange, copper like.