Random lines when I offset curves onto surface

Hi! I’m still learning grasshopper and I can’t figure out why there are so many additional lines when I try to offset 5 curves across a surface. I don’t know whether to fix my script before or just cull after, but I don’t know how to define things to cull.

My script is attached for reference. All help is appreciated, thanks!
whole facade try2.gh (196.3 KB)

You was using 4 surfaces and you actually need just two to offset on, also the data structure of the curves should match of the surfaces.

whole facade try2.gh (202.5 KB)

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I see what you’re talking about now, thanks!