OCTA-CONFIGURATION problem with px4 gazebo sitl

[mhk4zemi]

Hi guys

I have created one octocopter model in the SDF file and I created the correspondence mixer and posix files too.
The problem is that after sending the arm command, by typing the command:
commander arm

it says the takeoff is detected and only 4 rotors in the once side of the drone start rotating and as a result, it crashes.

The same behavior will happen, if I takeoff by typing the command :
commander takeoff
but once it is approaching the landing phase. So basically it seems there is sth wrong with the land or land detection or sth.

Does anybody have an idea what could be the problem?

[mhk4zemi]

I even changed the standard_vtol with 8 rotors with the octo_x configuration. But still, I have the same problem.

Here is the report of the flight in the simulator

https://review.px4.io/plot_app?log=0c474a4b-7fe9-498d-ae4c-469c277d5bf6

PS: I am pretty sure about the way I defined the mixer and config the sdf. Did anyone try to make an octa rotor plane who can help me understand what is going on?

Thank you all