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When exporting using "short edge" sizing, Lightroom is using short edge for horizontal and "Long edge" for portrait images. Very odd and has only been happening since 11.2
My export: 13 inch Short side at 300 PPI / 100 quality - so should come out at 3900x5850 for 2:3
Results: Landscape = 3900x5850, Portrait = 2600x3900
Been exporting like this for 10 years and I've not seen this before??
System: MacBook Pro (16-inch, 2021)
Apple M1 Max
I just tried this on my Mac with portrait and landscape images on my Intel IMac with on Monterey 12.3.1 and LrC 11.2 and it worked correctly.
Try resetting your LrC preferences file as detailed in the below article. It can resolve many unexplained issues. Place a copy of the current Preferences file on your desktop so it can be easily restored if the issue persists.