I have to watch this problem.

As you go up you may have a high backswing and bend forward at the waist.

Then you stay there, bent forward, ball goes down in to alley.

THe perfect foul line position has the knee bent and the chest not forward of the knee.  Some experts say only an 18 degree bend of the upper body in relation to the lane.  That means fairly upright!

Also the other problem could be a loose or improperly pitched thumbhole.

REgards,

Luckylefty