My game is not full screen on iOS 9 iPhone 5c
i have this game called underworld empire. Since upgrading to iOS 9, it does not go full screen. There's a black bar on bottom and top of game, as if I was watching an hd movie. I don't know how to fix it. I tried reinstalling. It's connected With Game Center and I cannot remove data from Game Center or I'll lose all my game data of over a year including money spent.