Vtol Tricopter Yaw Problem

Hello,
I have a VTOL Tricopter. Constantly yawning in QLoiter mode. I suspect the servos. Could there be a problem with the parameter? What could be the problem?
Watch flight videos
https://drive.google.com/file/d/1DdvdPCpMhXoqJZvaNXra7cYNPgmGr8Q7/view?usp=sharing