Try closing the app completely first and see if that fixes the issue....if not then a reset is a good next step.
When an app behaves strangely it is best to close it completely and then relaunch it. From the home screen do the four finger swipe up or double press the home button to reveal your multi task bar. These are all the apps that you have opened at one time. If you have updated to IOS7 - just swipe up on the image above the app icon to close it. If on an earlier OS - Long press the app until it jiggles and a red minus sign will appear above it. Press the minus sign, this will close the app, not delete it, now press the home button to return to your screen.
Reset - Hold the power off button and the home button simultaneously, keep holding them in and you may see the power off slide appear and disappear, wait until you see the Apple logo appear before releasing the buttons. It will take a little longer for your iPad to start.
Try them and let us know how you go.