Yeah 60 in ones are pretty poor compared to the alternatives (Real board, ArcadeShop, ArcadeSD, current MAME, AdvanceMame).
Remember they use something circa Mame .36 (best I could find reference to) as the base for the emulation. That is from 1999 (these boards first started appearing in 2003/2004 as 3-in-1, 9-in-1, 39-in-1, 48-in-1 and now the deluxe 60-in-1) but they all use a VERY old version of MAME. Back in 1999 the idea of color prom dumping and integration into Mame was only just starting, so many colors were 'estimated' with code in the emulation driver. So even if you have a monitor issue, it may be additionally impacted by a skew of the colors chosen by the emulation on that board, as well as likely a hardware fault on that particular board too.
Yellow = Red+Green so it seems in this case, perhaps the green background of that level is causing blurring in the hardware with the Red of the apples making them turn yellow more. Or are they affected the same with other screens and backgrounds (I dont play Mr.Do far enough to remember what graphics they use)
Also note that the "spare" Mr. Do!'s in the bottom left are completely different colors on the xx-in-1 than they are on a real board, or your character in the maze. Clearly this is caused by the old version of Mame and wrong color coding in the emulation, not even a hardware fault. (Edit: After comparing again, it appears that they applied way too much green to them, JUST as they did to the apples, turning the red polkadot clothing into the peach color as you also see on the apples. You're never going to be able to tweak that out without messing up the other colors on the screen where they are, basically, correct)
It's almost like whoever coded that color in Mame originally had some magnetism in the lower corner of their monitor and as such picked the wrong color to apply to that region/graphic.