Posted By:
RichardRobert - good question about the grey.
Of course, it is all speculation, but if I were the printer, I would look at the orange sheet and say, "Wow, I screwed up that red, but it looks pretty decent as an orange and I think they are good enough to keep."
Then when I printed the grey sheet I would say, "Wow, I screwed up that one, and it looks like crap. These need to be scrapped."