I don't know why two tarot cards changed from white to yellow. Will it affect the future divination results? What should I do?

Which card is your spirit? I can only think of two reasons, one is that the brand spirit of this deck is quite special, and the other is that you were splashed with tea without knowing it. If it is the first reason, I suggest you close the card and get a new one. If it is two, it doesn't matter. Take good care of the card in the future.