Why sweep1 failed after reparameterizing the rail?

The rail is a cloed curve and there are 21 sections along the curve, two of which are duplicated and are at start (end) point.

  1. I use the curve w/o reparameterizing, I can delete either the index of 0 or -1 of the sections to make sweep1 work

  2. I use the curve w/ reparameterizing, I can only delete the index of 0 of the sections to make sweep1 work, otherwise if I delete -1, then sweep1 doesn’t work. WHY?
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1.gh (7.7 KB)

I don’t know either but Flip Curve solves the Problem.

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