How to fix my incomplete curved surface when i unfold?

Hi all,

I have a curved surface (panel) that i want to unfold.
Looks like a simple job. still i can’t figure out why i get this weard result?
Anyone has a clue? Thanks in Advance.

Here’s the script / *.dyn file
losse plaat unfold.dyn (896.7 KB)
Here’s the revit file with panel!
20 overlap los paneel.rfa (428 KB)