Multiple curve offsets

Hello everyone,
I was trying to do this multiple offset of a curve, but GH give to me Figure 2, if I try to do another offset it goes to an error. The right offset is in Figure 1, obtained with Rhino. Can someone help me ?
Thanks.

Classical problem …


and there tons of other threads ending in
USE CLIPPER

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Thanks for your answer!

Just learning the series etc to do this was super useful for me, thanks!