Problem with land. PX4 HexaCopter

Assembled a fairly large copter 1600 mm. There are landing problems. Quadrocopter several times comes in for landing. Jumping near the ground. Firmware px4. There is no such firmware on arducopter - the quadrocopter sits wonderfully. Especially when you turn on the compensation of the earth’s surface. I tried to change the settings that relate to landing, it does not get any better. Help me.:grinning: