I never said all would show the doubling. You didn't fully understand the link provided, I meant that it is a common minting error on many coins types when the die starts to wear. Not necessarily common on this coin type because when the die gets too worn, they polish the die or replace the die. Minting 42,000,000 coins will wear a die out. No doubling when new, some doubling after wear begins to set in. If you search 42,000,000 coins of this year, you will find many more with the same doubling. Of course not all of them or even most of them will have it but many will.