When you hold the ball in your stance, is it in front of your body?
If so when you swing the ball to the back, it will tend to go away from your body(to the right if your right handed) and when it comes forward it will pull to the left of your mark.
Try holding the ball inline with your shoulder, this will help keep your swing on line. You can also try holding the ball a little right of your shoulder if needed.
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