Problem servovoltage Pixhawk v2

I servovoltage

I have two servos in a plane(VTOL X8) with firmware 3.10.0. Sometimes, the value of the servovoltage is 2, 12, 9 V . Do you know if this is a problem in the configuration? I tried connecting the power of servos separate but it didn’t work. For example, I have some of this servos in “AUX OUT 1”. I don’t see in mission planner that servo receive the signal: "ch1 out’ doesn’t change. “Ch1 in” changes when I use the radio, but not “ch1 out”(signal that servo receives) and the same occurs with the other servo. Is pixhawk ok? How can I solve this problem?