This is a common fault, especially for taller players, even Ali Cook struggles with it.
Without seeing you play it is a bit hard to help, my guess is you may be a bit closed at release and your head is getting to far to the off side or is falling over and your eyes aren't level. Alternative you may be planting your front foot a little and be trying to play around it.
There are a couple of ways of fixing it, but without a video of your batting it is difficult to provide an easy answer.
I would try to have a marginally open stance and try to ensure your eyes stay level by lining them up with the peake of your lid/cap/sunhat.
Weight wise I would have your weight about 60% on your front foot and work on leading with your eyes to the ball. You will need some practice to get your head moving to the ball rather than to the off side of it.