Why is there a circle at the end?

[Held_Ramona_heldr2]

I could create the sagging arcs as I wanted, but there is still a circle at the start/end point that I don’t want

Does anyone know what the problem is?

Skript_Circle_Problem.gh (20.8 KB)

[Gijs (Gijs de Zwart)]

The polyline creates duplicate points, if you remove them that fixes it:
Skript_Circle_Problem_solved.gh (15.9 KB)