How to fix twist?

[travis.designer.vn (Travis Nguyen)]

Hi

First I use Tween between two curve

Then Divide Array of curve

Check Curve Seam

Then run Panel Custom 2D

How can I fix twist?
chestnut - rhino 6.3dm (439.6 KB)

Thank
Travis

[jessesn (Jessesn Chen)]

I think this is a bug to the command _ptGridUCurves, I will make a YT to it.
Here is a GIF tutorial about how to fix it, wish it will be work to you.

[rajaa (Rajaa Issa)]

I put together a clip repeating your process and the result came out as expected. Did I miss something?

[travis.designer.vn (Travis Nguyen)]

Interesting, now I know the issue from order

Thank for your advice.