Yeah so: TL DR: All expansion decks cause this issue, and (some) Core Module decks will also be affected by it. What you're seeing here is a game started with just the Core Fiasco Module. I've taken three cards from the three different Core Playset Decks Dragonslayers, Poppleton Mall, and Tales From Suburbia and placed them on the table (in a regular game you use just one of those decks, I happened to have drawn 3 different types of playset card from each deck). In the bottom right corner of the cards, you can see that they belong to their respective decks. Everything good so far. What you'll see now, is directly after adding the first expansion module Feel The Rush to the same game, with the Core Module already loaded. (I had originally encountered this after loading the Core Module and then adding all expansion packs before ever loading the game first, so it works both ways). I've deleted the previous "Location: Historic Downtown" card from the Tales From Suburbia deck to make room for the next example. What you'll see here, is two cards that register as being from the expansion deck, both the In The Weeds and The Hasty and Hateful (as noted in the bottom right corner of the cards, which I've again highlighted). The bottom two cards. However, both cards were not pulled from their corresponding expansion decks. I tried pulling them from both Dragonslayer , and Poppleton Mall respectively. Upon attempting to pull out a Dragonslayers card and put it on the board like before, I instead get a card from In the Weeds . Pulling from Poppleton Mall gives me a Hasty and Hateful card. Oddly enough the Tales From Suburbia deck from the Core Fiasco module still works normally. After double-clicking the Dragonslayer deck to look through it, the card I pulled "Relationship: Romance | Uptight bartender..." does not exist in the Dragonslayer's deck even though that's what it gave me. Adding another expansion pack yielded similar results, again converting the expansion decks to In the Weeds and Hasty & Hateful -- however if loading a fresh Fiasco game and loading a different expansion set first, it will overwrite the other decks to those from that expansion instead. If adding the expansion set with In the Weeds and Hasty & Hateful again to a game that has Core and another expansion loaded, it will favor Weeds and Hateful. Makes me think somehow this is some sort of index reference mistake in the code somewhere. To clarify that last paragraph a little, even though the decks from the Feel The Rush expansion will seemingly be favored (I think) even with other expansions mixed in, other expansion decks will ALSO have this issue with overwriting the other decks in this way.