Is it the issue of this tiny set screw on yaw axis not aligned properly, or something else? I performed gimbal calibration, set the mode to FPV, but it didn't help much.
If the gimbal calibration doesn't work, you can always adjust the gimbal manually in the DJI Go App. I always felt like my gimbal was off by the slightest amount so I just adjusted it that one time manually and now its fine