i was in the group buy too. its really sad but i have yet to install them. car has been down for other reasons and the leather has not been a high priority.
anyway your pictures scared me so i pulled out the leather and compared it to stock. the leatherseats and my stock leather look the same but both look different from your stock cloth seat. if i remember correctly, when we ordered, they asked if we had stock leather or cloth, i guess this is the reason. im guessing you got the backs meant for the stock leather by accident.