Wrong movement between splines

[Sergei543071]

The train after moving to another spline teleports to the end of the spline. At what at an object the train is Body and two more child objects which also to roll on a spline and that is the body moves depending on these two objects. That's when these two FrontAxis and BackAxis objects call on another spline, it happens so that the body with FrontAxis teleports to the end of the spline, and BackAxis stays at the beginning and moves right along the path. I will attach screenshots and video. Thanks in advance for the help


https://www.youtube.com/watch?v=T_VxpMpxzKw&feature=youtu.be

https://imgur.com/a/nEUwfl5    - Screenshots