Yes I notice it, only good results I could get was from copying first curve and them modify it. But when I draw second curve I got that twisted result. I need it to have ability to modify surface by moving points after it was trimmed. That is why I wanted to have predicted amount of points. Is it any way to align second curve that was drawn to get not twisted result?

And could you pleas tell me the logic that used to create seam. As I can see it is not lay where curves was closed.