RE: Strange GYRO workings !!!!!!
If your servo works connected directly to the receiver, then the problem is with the gyro.
If the gyro is not an HH type, when you rotate the gyro the servo arm should move then go back to center.
The gyro senses rotational movement and correction is only a momentary input to the servo. Slowly rotating the gyro may not cause the gyro to attempt correction. HH gyros operate differently.