Elevonright servo is not moving

Hi everyone, i came into problem, in my rjvet i set servo outputs into elevonright and elevonleft, when i try do pitch with rc elevonleft servo is moving, but elevonleft is not moveing, but when i change places of channeles, i mean when i assign to right servo elevonleft and to left elevonright, the elevonleft is moving but not elevonright.
I use Pixhawk 4, Futaba T14SG RC
Can anyone help me?

Hello!

Have you made sure that this servo works at all? What if you assign this channel as a passthrough channel and try to drive it from your TX?

Or even connect the servo plug directly to a servo tester?

Thank you very much for reply, servos are working, i tested in servo tester, also i plugged 2 other servos to RV Jet, they also move weirdly, like the previous ones, i think the problem is connected to mission planner and pixhawk