IOS 7, on screen inverted, why?

Hi, whenever I turn my iPhone 5 with iOS 7 on, the picture when it is turning on is color inverted. Instead of the apple logo being white, it is black, and instead of the background being black, it is white. But when the phone is on, the colors are normal. I don't like the look of it turning on and its ugly to me. Why is it like this? Is there a fix? I know other iPhones with iOS 7 are normal, but not mine.

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