I’m stacking 20 light frames in DeepSkyStacker 3.3.2. My original images are 4282×2848, but the stacked result comes out around 1088×2874 with the aspect ratio badly altered. It looks like only a narrow left-hand slice of the original frame was saved, rather than the full image being rescaled. Registration and stacking complete normally using the recommended settings. Is this a known issue, and what causes it?