Gamepad Analog Stick Problem

[Kuy555]

I played the whole time with a gamepad and there were no problems. Once I had the problem that when I pressed my left analog stick down, my character just walked down instead of running down. And that the whole time -_- I couldnt fix it so I had to switch the function of the sticks. So my left stick was for camera, and right for movement(annoying i know). Now I just tried to switch again so it could be normal and it worked. Then today its again this "bug"...When I press my L. A-Stick down I just WALK down -.- Would be very nice if someone could help me ; ;