about flex command

hey...dear! i wanna make a mold of a gas turbine blade and i'm facing a problem here is that when i complete the flex twist and flex bend command and apply the parting line command the crazy split line coming out on the faces...yoy see in the picture.i have done max the flex accuracy but i'm still facing this problem.....please hlp me.

SolidworksPlastics And Mold Design