I mean, if you use your brain for a second you could figure it out
Pills contents (filler, active ingredients) are completely randomly placed. You can't control where it goes (top, middle, bottom, sides, all irrelevant)
Also, people might have gotten a stamp that wasn't as "flame" as another of that color and scraped it off to say "these were actually As" when they were really equals or something else
Or, since you've had a few mints in your time, you know how crumbly they are, maybe they were packaged tighter than others when taken from place to place, who really knows?
Tbh the new (thicker) mints are absolutely made different than previous wafer mints, I had purple blanks that looked like the surface of the moon, as opposed to the well defined blanks of the past
My theory? The mint organization is pumping out more and more mints quicker than ever (they've created a brand and now the demand is creating a bigger supply)
Or they just got some shittier, more cost effective presses
Regardless, we will never know why, but if someone were to scrape off a lil from every mint you wouldn't miss much and your dealer would end up w a decent amount of free mint residue
It's like using a Kief box on your buds IMO