If you are meaning on the left when sitting in the cab I think it is because of material doubling over on top of feed stream as rotor and helicals do not move it past the feeding area in one revolution. We changed our machine over to what NDDAN is doing with the triangle filler and steep pitch helical over feeding area with no reverse bars and did that ever smooth out machine in tough going. I would recomend these changes, they sure worked in my conditions. You can see them on their website, I don't remember the address, but you can search for it. The dealership is Hurtt Equuipment in Hoople N.D.