According to this link, “A mistake in the minting process for some quarters issued last year is putting coin collectors in a frenzy.”
Check your pockets. 
Dammit. Boring old P-minted Wisconsin quarter! I could really use 1500 bucks.
I’m amazed we’re getting them here in state #11, since I know that they’re circulated first in the state they’re about. Tourists bringing them in, I guess. But I have all of them so far.
OK, I’m looking at my D-mint Wisconsin quarter, but have no idea if I’ve got a “Extra leaf up” or “Extra leaf down” one. It’d be nice if there were an illustration of the two, though the one I’ve got looks close enough to the “official” one that I suspect I’m out of luck.
I had to e-mail Mrs. AG though, because she would otherwise likely spend her quarter on the Fruit Chew dispenser near the exit of Longs Drugs.
OK, this link shows an irregular quarter. This one appears to have a second leaf curled under the higher curled-down leaf on the left side. Still not sure if that’s the only irregularity or not, but it doesn’t look like mine, that’s for sure… 
Close up pictures here.