Problem with Walking Animation
 

I'm having an issue with my walking animation in the game I'm making. I have the method on the object level of the chicken (of which I want to walk) and the method is set to [I]While Up is Pressed: During[/I]. But the problem is when you release Up before the animation ends, it messes up the animation for the next time you press up.

Any help on how to fix this is appreciated :D

Attached is what i have of the game so far. It is Project 1 Chapter 8, if you want a reference.