onRelease on a tablet PC

I am creating an application for a Nokia N800 tablet PC and for some reason their is this one button that you have to double click(double tap with the pen) in order for it to work…I cant figure out why. And you dont even really have to double click like you would a mouse…you can click it once, wait a minute then hit it again and it will work or click it once, 10 seconds later do it again and then it works…any idea why this would be??