That’s the SAS ( probably ) - try turning all the SAS & AP off & you’ll see what the underlying helicopter model is like. I can’t stand SAS in helicopters, they just get in the way.
Can’t say I’m terribly happy with the mini-500 atm - for something with a big spinning thing it’s a bit short on gyro efffects, seems rather Cabri-like in the way it’s got enormous fore-aft trim change but no lateral ( to be fair I guess that is…vaguely possible), and it’s got no resistance to the stupid little bumps the current atmo model throws. Does not really feel much like a flying vehicle.