Surface trim acting weird

Hi guys,

Im trying to model an open helemt and i can figure out why the surface trim cuts in the marked red circle in a way that it creates like a spline in the edge when im aiming for just a straight cut there.

Can you help me out?

Another question:

plane 6 uses a point in sketch 1 which only comes afterwards, how is that possible?

Sharon

SolidworksParts And Features