Simple servo gimbal. Outputs are mixed

Hi! I’m setting up a simple gimbal made of two servos for pitch and roll.
Everything works fine, but when I enable the “Stabilize” option for roll and pitch in Mission Planner, the servo outputs are mixed. In other words:

When I tilt the aircraft both servos (pitch and roll) move,
and when I roll the aircraft, also both servos move…

If I disable one axis in Mission Planner, the other servo continues to move when both axis move.

Is this the intended behavior? I suppose that only one axis stabilizes one servo.

Thanks