Why is my screen has three separate color difference?

I need help guys. My phone has very visible color difference when i am watching a video on youtube especially on a white srcreen. Is very annoying as is stands out very clearly. The seperation is at the area when you are watching the video on youtube in portrait mode and the other separation happens on the black bar at the top where the notification are. Its very obvious when turning to landscape mode to watch youtube as the screen has area that are darker then the rest. Is it fixable?