Yaw angle be affected by motor?

I have make a drone, and I have a problem now.

My drone sometimes rotates along z-direction, I think yaw angle is incorrect when it fly. I check yaw angle and find it is affected  by motor. When I change my motors' speed, yaw angle also be changed about 10 degrees. But if I measure yaw angle on the ground near the drone, yaw angle won't be changed.

Does anyone know why?

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