Sweep 1 Problem in Grasshopper

Hello everyone,

Can anybody tell me why this simple sweep operation gives me an error?

Sweep Problem.gh (3.5 KB)

It works fine if you move the section to the curve end of the rail or the other way around the seam to the section.

Sweep Problem.gh (8.5 KB)

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Thank you so much, yes, now it works! I think when we do it the normal way, the program takes care of this automatically somehow…