Timing of the animating lines getting changed

video link: community doubt.mp4 - Google Drive

In the above video the green rectangle animating within the path of 4 vectors. Both the smaller paths shown is the duplicate of the same component and similarly the big path on the top. All the timings of the animation are same however the timing of the animation (ie. green rectangle animating within the path changes without any consistency). I don’t know what is the problem in this animation.