It looks like you're not quite using card codes the way Multiverse expects you to. You're certainly free to enter the card code in the cardname if you want, but the skeleton expects that you'll enter the code in the separate box on the right labelled "Code" (just above the "Active?" checkbox). If you want to show a card's name-and-code at the same time then you can do that with a link like (((-CW99)). Currently that just looks like CW01 Devout Healer, but once you edit a card to have code CW01, it'll turn into a link to that card, including both its name and its code.

Nono, I know that's how the codes are supposed to work, I just didn't fill them in yet since the cards themselves are still up in the air. I just put the codes in the names for now as codenames.