If the app works abnormally, try force quitting and launching it again.
- From the Home screen, click the Home button twice.
- Tap and hold on any App.
- When it starts to jiggle, tap the - to close the App your want to quit .
- Double-click the Home button and try opening the app again.
iOS 7.x (Answer from Apple Support):
- Double-click the Home button.
- Swipe left or right until you have located the app you wish to close.
- Swipe the app's preview up to close it.
If the problem remains, please get in contact with us.