Terrain Following not working on PX4 Pixhawk 4


I am writing today because I had a problem yesterday. During my survey (set with QGC), I activated the terrain follow.
I am using a distance sensor (lightwave SF11/c) and I set all parameters to allow my distance sensor working.
But, even if the fused altitude seems to be good, the drone is following the barometer altitude and flight higher than I need.
However, I put the distance sensor as the primary source of altitude.

Here an exemple of a flight but I have several others… Drone not following terrain with distance sensor

Thank you for you help !!