Why won't this sweep work?

I’m trying to setup some sweep1’s in order to create a bunch of windows based on a perimeter curve. Some sweeps work, but others don’t, and I can’t figure out why.

2023.08.28_GrasshopperForum_01.gh (3.8 KB)

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Sometimes Swp2 works better than Swp1.


sweep_frame_2023Aug28a.gh (7.3 KB)

Thank you @Joseph_Oster

The seam of the rail and the section should line up. Here is an updated version that first adjusts the seam then moves the section so that both seams align.

2023.08.28_GrasshopperForum_01edit.gh (10.0 KB)

Funny thing is though, it does work in Rhino.
Ah, but I just noticed it results in an open polysurface…