A yaw fusion problem

I am trying to feed vision data into LPE in version v1…5.1. The vision affected attitude estimation q clearly, but the direction is opposite. When I turn the drone right, the output of it turn left and when I turn the drone left the output turn right. I thought maybe I confused yaw so I negated the yaw of the input but there is nothing help and the situation is completely the same as before.
I wonder why after I negating the input yaw the output remain the same? Should it negate as well? And how can I solve the problem that the output yaw is always the inverse of the input yaw?