This just happened to me as well. It seemed to happen with more frequency as I opened more and more packs, which makes me suspect that it's rolling in the Alchemy table, checking if you have a playset, and if so giving you a ONE card of the same rarity, instead of giving you a different Alchemy card of the same rarity like it's supposed to.
This just happened to me as well. It seemed to happen with more frequency as I opened more and more packs, which makes me suspect that it's rolling in the Alchemy table, checking if you have a playset, and if so giving you a ONE card of the same rarity, instead of giving you a different Alchemy card of the same rarity like it's supposed to.