Project point on lines, points missing

I used “project point” on 2 curves with vectorZ axis , in order to place an adaptive component, but some point aren’t projected.
I’m sure that the two lines have the same x,y coordinates : these are projections in Z axis.

I don’t understand why !

Can anyone help me?

Can you post your dyn and a Revit file if one is necessary?

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thank you

Membrane20171110-3.dyn (48.4 KB)

Can you try extracting the planes of the parameter/points on the curve and getting the intersecting geometry of the planes and the upper curve?