If I view part of an SMS convo in the middle of my iPhone5 screen, the shade of green is an awful snot colour with dreadfully bright white text contained within it but if I view the lower third of the screen then the shade of green is much darker and the white text is less bright. Overall, the SMS app looks *much* nicer in the lower third of the screen and terrible in the middle. Is this normal or is my iPhone5 screen defective?