I don't see a problem, other than vignetting.
Edit to add. The 533 has a square sensor, right?
I downloaded the image and stretched it...Field Rotation is very apparent with the 533 square sensor cam...This is completely normal for an Alt Az mount and looks like about 30 to 60 minutes of stacking...Pat Utah
I will add my .02 worth of advice...Your 80 mm telescope combined with a fairly large sensor if very well suited to AP (using an EQ mount), not so much for EAA. You have a huge FOV and that is why all 4 sides of the "square in question"are showing. With a smaller sensor maybe only one side of the square will reveal itself. I have used a ZWO 290 mono cam at 540 mm and there is very little apparent field rotation. Field Rotation is a complex subject and the magnitude depends where you are pointed to (N,E,S,W) and what your Attitude is. Here is a link with a lot of information...
Edited by Alien Observatory, 01 June 2020 - 08:41 PM.