i'm no expert, but i had this problem.

i fixed it by squaring up my shoulders to the way my feet were facing and moved the ball back in my stance..

i use to set up with open shoulders facing left and my feet facing right. the ball would look inside my front foot. if i set up like that again it would be well outside.

instead try and line yourself up more and make sure your shoulders are lining up with your feet. move that ball back which should help. just think you have an iron in your hand and set up exactly the same.

worked for me.. give it a go.