It’s likely that the pressman was printing the cover when someone notice that the yellow was missing. They then stopped the press, made a new plate and printed with the correct color break-up. The only question that comes to mind is how much was printed of the error variant? It looks like 2 out of every 5 are white variant. Judging by the number of correct copies to error white ones on the internet. If marvel had 40% subscription print run of out of 800,000 printed that will give us 320,000. Educational guess from information previously posted on these boards. Strangely 2/5 leaves us exactly 320,000 of white variant books. If you work in printing for a living you will know that the mailing list must get out first, that’s the bread and butter of the company.
Conclusion: just a guess from printing experience
320,000 were printed quickly to get the mailing out
480,000 were printed with correct color plate
Again guess of fussy math, you can arrive at your own conclusion