Yeah, there's only 1 copy of each card in the game, and you only need 1 copy of each. The only thing I can think of that you might be doing is seeding cards for all available choices in a single room. Before you begin seeding cards, make sure you go through the initial setup by reading through the available choices and making your decisions. Then, when seeding cards in a room, notice how there's always 2 options for each room based on the decisions you made during initial setup. You don't seed cards for all of them, just the cards associated with the option you chose. For example, let's say that for "Fall of House Lynch" you made the following choices: 1C, 2A, 3B. Then while seeding cards, if a room has cards for 2A and 2B, you will only seed the cards listed for 2A. Likewise, in a room that shows cards for 3A or 3B, you will only seed the cards for 3B.