White bar at the bottom to the view - ios

I have a background image on a view controller, it is shown as expected on the simulator, but on a real device, a white bar is shown at the bottom of the screen. On another view, with another background image, the white bar appears on the top of the screen. Any hint to detect the source of the issue? It doesn't happened on the simulator, it happens only on a real device, it is an iPhone 4 with iOS 7.

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http://twitpic.com/1gutqp
http://twitpic.com/1gutjr
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