Picked up my brand new 20hp 48" deck walker today. I had read that they are extremely thorough while sucking up debris. There is a lot of debris shooting out the two vents on either side near the decks rear. The lawn is dry and short. The debris is shooting out onto sidewalks and the road. At first I thought they gave the the side discharge deck by an accident, but it's coming from the two vents. I'm pretty sure it's just that I don't know what I'm doing, can anyone tell me what is happening? Thanks.