Combining curves and keeping the logical sense is very random.
Similarly, creating plans from a point can give different results.
And I don’t think we have to trust.
You must keep the references to the plan and sort the points on this plan.
The SortPoint component gives incorrect results because it does not accept any tolerance.
So you have to sort the dots yourself.
Flipped_Curve_bug-01-SortPoint.gh (14.9 KB)