White borders on Planechase 2012 cards

All cards from Planechase 2012 appear to me with white borders - be it in hover images, visual spoiler in my inventory or wherever. Cards from the original Planechase look normal (with black borders, that is) - only Planechase 2012 look weird. Anyone knows why could that be?

Edit: Upon closer inspection it seems that they are actually without any borders at all... Compare for example white-bordered Ravages of War with weird-looking Krond the Dawn-Clad.