Why the "tween curves" doesn't work?

[w.wu]

Hi guys,

tweentest.3dm (45.0 KB) tweentest.gh (3.4 KB)

As the pic shows, I have consecutive curves (black ones), and I want to tween curves from them. But the resulted curves are totally out of control (green ones).

Could anybody have suggestions?

Thanks!

[Jakinta]

You just had to align curve seams…

[w.wu]

Thank you so much, Jakinta!!