Spline mesh not following properly Spline in Z Axis

I was making progress in my game when i realized that i have that error, i have previously created this with the help of community: Help Making the trail, but i have this error, that i cant just resolve it, its like it cant align well with the Spline in the Z axis unless is near 0 in the z axis, here is a demostration of my problem (focus only in the red line):


this is the code that makes possible to follow the cycle, conciderating that the collition trail is a separated actor from the vehicle.
Spline logic 1:

2:

Spline mesh:

logic that updates the splines:

any help would be appreciated.