I feel the garage camera’s rotation does not reach the right position as it supposed to, what happened?

The most possible reason is the camera has been rotated manually which interupted the memory of the camera motor. If you have manually moved the camera, or camera’s Initial Viewpoint does not match the original setup, you may need to calibrate the camera motor again. Tap Device Settings > Camera Motor Calibration to calibrate the camera’s Initial Viewpoint.