Packing circles: why gh pick the wrong offset side for some circles?

Grasshopper Kangaroo
1

Hi all!, a newbie question: Offset goes to the outer side of circles near the base of this semi-sphere. Why?

Packing circles over surface.gh (33.8 KB)

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PackingCircles
PackingCircles.png1021×839 368 KB

Packing circles over surface_re.gh (34.2 KB)

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Thanks dowazura, it works cool!