Hello! Thanks for sharing your experience with the game. The card in question is Circle Back and it reads "When you sell another perk for the first time in a round, make a copy of it."
It seems like you're interpreting "for the first time in the round" to refer to the first time you sell EACH other perk instead of mean the first time you sell ANY other perk. Does that feel like the root of the miscommunication to you?