Flip matrix

I´m trying to divide my skyscraper into two at the top, I can´t make the nurbs curb of each side and I´m not sure why, each 5 points it´s should be a nurbs curve, which is a floor
15-1 Camila Sámano.gh (398.5 KB)

Canvas at 01;27;34
15-1 Camila Sámano_re.gh (404.4 KB)

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