Tailsitter motor not spinning at initial throttle range but at 50% both are spinning equally

I’m using ardupilot for my differential thrust twin motor tailsitter but when i arm my vehicle but one motor is spinning and at 50% throttle another motor is spinning I checked the logs but own input for both is same , please can anyone help

If your motors behaves differently with same RC_OUT value, you need to calibrate ESC. This page explains steps on ArduPlane vtols. ESC calibration — Plane documentation