Error with Acadia ATB Quarter

2012 Acadia America the Beautiful Quarter:
https://en.numista.com/catalogue/pieces35025.html

Denver and Philadelphia did not produce any silver proof coins.  They should be removed from KM# 521a.

*bump*

I tried editing the coin data but it seems I can not remove years.  If someone tells me how to do this I'll do it myself.  Otherwise someone will need to delete the extra mints from the 2012 silver quarter.