Phone as two different screen tones

Couple of month ago i noticed the there is a different tone to part of my screen.

When i checked it it i saw the area were my notification bar is located as the "normal" color while the reset of my screen as a reddish tone\tint.

Already tried to play with display setting and to factory reset my phone but no luck.

An illustration of the problem

http://imgur.com/a/do11k