Solid difference + multiple sweep

I’ve seen this issue before, actually on a very similar post (Acoustic panel ellipses - correlation between sections A-B1, A-B2, A-B3 etc. and the depth D1, D2, D3 etc), but I’m still not sure where the problem arises. In the past I used Rebuild Curve, with a high number of control points to approximate the original, and this seemed to work…but not this time. I tried all sort: rebuilding using interpolation curves, making all of the curves periodic through python…etc, etc, but nothing seemed to work 100%.

In the end I split the closed curves into two, and this seems to have worked.
3_5_V2.gh (185.1 KB)

I would like to know where this issue comes from though. Not sure if its a bug.

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