Help with Beginner Ball

As stated in Synfig wiki, I started out with the simple Knight Rider animation. But for some reason, the circle moves to the right and stays there for the rest of the animation. What have I done wrong? :blush:

Hello nerdygirl and welcome here …

i think it’s near the keyframe :

Do you have a waypoint (orange diamond or green circle) at the last frame 48? If not then go to frame 48 and then right click on the waypoint of frame 0 and select duplicate.