getting the head shined up is probably the problem. you might look into the tilt of the feederhouse if have a contour maser. make sure the reel finger height is correct 1 1/2 inch from the sickle. this adjustment has to be done when you change the aggressiveness of the fingers. finger timing of auger could cause this, fully extended at 3o'clock in relation to the floor. finger height 5/8in . this is in opps manual with a little more info. normally the crop will roll over the center of the auger if the fingers are not times correct so I don't think this is the problem but I could be wrong.