Holybro Pixhawk 4 px4 (1.8.0 master) Takeoff issue on Skywalker X8

Hello guys. We have some troubles here. We are trying to configure pixhawk 4 for full autonomous flight.
Before the launch aircraft sets elevons up and then exactly after launch, it throws elevons level (I think it tries to stabilize itself) and the next moment it sets them up again, but its too late and Skywalker already touches the ground. We have some videos of the launch and all logs.
We really stucked at this moment and can’t find a solution. Any assumption will be very useful. Sorry for mistakes if they are present (my native language is russian).

Attaching some logs and video:


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