Problem to pipe a rail curve

Grasshopper
1

Hi all,

can someone take a look why these 4 curves are not able to pipe in grasshopper.
Curve_pipe.3dm (138.9 KB)

2

It seems to work fine here.

Canvas at 03;21;05
Canvas at 03;21;051386×436 216 KB

3

This is really odd i tried it again and it works wtf.
Befor i got a lot of twists and strainght deformations so i used a c# script with

This method worked in grasshopper but not the default one and now without any change it works…???.
Anyway thanks for testing.