Please make sure to exit the game correctly. On an iPad, iPhone or iPod touch, press the Home button on your device and the application will be minimized and you will return to your device’s desktop view. Then press the Home button twice and the panel with launched applications will pop up at the bottom of the screen. Press the game icon for the game you wish to close and hold it until the icon starts vibrating, then press the minus "-" sign to close the application. To hide this panel, press the Home button on your device again.
There is a slight difference in iOS 7. What you need to do is double click the home button so Multitasking pops up, then swipe up on the open app you want to close.
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