Reposting answer from reddit to here since I removed it. This issue was MX3 initially, but seems to be related to some other headphone DAC/AMPs
The issue is either in windows or some kind of feedback near the DAC.
Feedback from other power sources near your headphone wire, something as small as a bluetooth mouse in between my headphones triggers this.
The amount of interference from other devices is REALLY SMALL, make sure no power cables or such are near your aux.
Legal bullshit below by not-a-lawyer.
Now I don't want this answer to go back into reddit so...
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Really? I didn't know that.
When I did the color shading test I failed crazy with the shades between green and red, including yellow. Obviously I failed the whole board, but that was the worst though.
Can you try to see the difference, because you should see it, with colorblindness the shades are just harder to see? If you actually cannot tell the difference you might have something else than protanomaly, like missing one cone completely rather than a shifted one.
Unless you meant protanopia, rather then protanomaly, the -nopia means a missing cone aka dichromacy, and -nomaly a shifted one I think?