MaciejS
OK, your Set A and B shows that your mount is perfectly tracking the sky. I.e., even though the sky is moving, the mount is also moving (tracking) to match it. So we can assume there is no hemisphere problem.
Sets C, D and E is more problematical.
Notice that Set C started at RA = 21h 51m 12s dec = 63º 23' 19" and after an declination slew, eded up at RA = 21h 51m 33s and declination = +60° 20' 25". We expect a declination change (since you slewed, but RA should not have changed (neither should the camera angle).
Now, Set E looks rmuch more reasonable -- after an RA slew, the declination remained the same as in Set D. Which os what you expect.
However, the camera angle changed again.
So, this is the weird part... Sets A and B confirms that there is no RA drift of the mount relative to the sky (both are moving in sync), but set D shows that RA has drifted even though it should not have.
Do you have another mount that you can use? Something is not right with your mount. Or something is not perfectly tight, so that there is movement in RA direction betweem Set C and set D.
It is possible that you have a severe cone error -- i.e., the declination axis is not perfectly orthognal (perpendicular) to the RA axis. This could come from poor manufacturing. Another possibility is if the declination dovetail plate is not seated perfectly on the declination mounting sirface. Another possibility is that your OTA is not parallel to the declination plate.
By the way, have you tried turning off guiding completely to see what the drift looks like (if it is better that the video which you showed)?
@Tech@ZWO should be answering your questions, why are they trying to avoid their responsibility?
If ZWO keeps not answering you, do not buy from them anymore.
Chen
