Ubuntu 24.04 Joystick readings

hi,
I initialized SITL for my drone in the terminal and connected it via QGroundControl. I attached my Radiomaster TX12 as a joystick, and it detects input values. However, the readings are incorrect—throttle is not on Channel 3 but is instead controlled via Switch E. I tried changing the RC mode, but it didn’t work.

How can I fix this issue or find a workaround?"