Hi @lester_derek,
Thank you for your patience here. We took a deeper look at the files you sent, and it appears the actual file for the rotated cover has an Exif orientation value which could cause the image to rotate in certain viewers. None of the other artwork has this particular orientation value, so I suspect that’s the culprit.
I recommend removing the Exif tags for that particular album artwork or replacing it with another image which doesn’t have Exif tags. It should then display with the correct orientation after a restart of Roon. Please let me know if I can clarify further.