4k60 Pro - Weird Artifacting at lower resolutions?

Hey all,

I've been testing some different sources and more modern stuff runs flawlessly. However I thought I'd give my old OG Xbox a run and I'm running into persistent large artifacting. I've got an example (apologize for personal youtube, unlisted vid.) https://youtu.be/MKKf6lRzT9c?t=17 You'll see at 17 seconds an example but it continues through the video seemingly more aggressively on vertical lines that are moving horizontally.

The card reads the signal as 720x480p which is correct for the game. I'm utilizing the pound hdmi cord.

Thinking that maybe it's a mismatch in FPS I switched from default to 59.94 which made the artifacts larger (seen in vid above.) I tried 60 as well with the same issue.

Thought I'd ask if anyone had seen it, tried to trouble shoot as far as I can. I almost wonder if the pound cable being a bit notorious for wonky signals if maybe that is the actual culprit even though the TV interprets the signal normally.

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Many thanks!