Posky 737NG Front Gear Up and Down

Hi there!I am using Posky 737NG in FSX, the front gear is normal while the plane is parked, but it seems to be abnormal in following situations.(1)When the plane is moving whether fast or slow, the gear dig into ground if brakes applied.(2)When the engine is providing power that over 70% N1，the front gear will simply lift off the ground, even if it is only 60 knots...(3)When aircraft is stopped and brake released, the gear bounce back too much and into the air a little bitI think there is a problem in FDE, do anyone know how to solve it?Thanks