Don’t worry about the past, that’s uncertainty (the only demon we have to truly banish!) trying to tear you down a peg or two, your readings were probably fine before, but yesterday was the New Moon, maybe that was why the deck purged itself of a card that won’t help readings?
Just start afresh with the deck, maybe cleanse it (you can cast out any unwanted energies with a crystal using methods like this) - it’s only 72 cards, I like to lay mine out into suits every few uses as a kind of “reset” but that’s just a personal thing, and I’m not a pro or even that much of an expert in this method, I just like having them. 