VTOL bouncing up during landing

When flying a VTOL aircraft with a wingspan of 4.9 meters, we always experience the phenomenon of bouncing up again when landing close to the ground. The pilot must quickly switch mode to manual driving, otherwise the aircraft will quickly approach the ground after bouncing up to a certain altitude. What I want to ask is how to correct this issue. I have searched for all the parameters but did not see any relevant introduction.

What I understand is that copter has (Ground Effect Compensation: GND_EFFECT-COMP), and I have tried to enable it before. It did solve the problem, but I have not seen any similar parameters on VTOL so far.

If you know any information about solving this problem, please reply to me. Thank you again.