you need a service rep, I guar un tee you have a major setting or mechanical problem. That is 1.5bu_A loss. The only way this can happen is if the distribution auger is dumping everything in the center or if chunks are off the accel rolls in the center, you said not, or if there is either too much or not enough air in one sectio of the fan (coated over blades). Beans will not bounce out. They are either blown out or ride out on a mat of material. I do not like to use a corn chaffer in beans or any crop other than corn.