Problem to pipe a rail curve

Hi all,

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

It seems to work fine here.

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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.