Some times mesh distortion.

[mammuoils1]

Hello, I have just tried Curvy spline in the last few weeks. My project used almost scene setting for 51 InfiniteTrack( InfiniteTrack.cs). I set some point in space with my rules ( point never duplicate ) then i spawn mesh like the examples. But some times i make some mistakes like the mesh is distortion. This error happens with some case of special position point spline.  But i don't know why. I create a spline, creat buildGenerator and updateSectionGenerator to follow the begin and the end point cp in spline. I try to read build Generator but i have not still known the reason. I attached my picture showing my error, hope that you can help me with answer. Thank you first
https://imgur.com/VtsZEfc
https://imgur.com/zEaU1If
https://imgur.com/PBNxVvL