My first carrace project *need help

I’m working with a car race game, but I’m stuck at one point.
I made few short animations to the car, and one of them is not working corect.

  • The problem is, as you see in the end of the video, that the car moves back to the start point when I press forward to give speed. I think its because in the animation it has saved the location of the car too, and I’m new to blender, and dont got so much experience with it.
  • Have used blender in approx two weeks now.

If you know whats wrong please comment.