Once upon a time I worked in the HP facility in Boise ID on upgrading the Color LaserJet. One of the engineers in my group ALWAYS complained about brown… no matter what she did it always came out looking like (and that’s in the CMYK space).
Must be that top quality “HP authentic” toner. Love those cartridges with the chips in them that trigger the warnings on the printer if you try an off-brand.
(and that’s in the CMYK space).