Changing card details in a decklist adds the Edition/Rarity column

Title doesn't exactly describe the issue cause it's hard to sum up in that amount of space. I'll just outline the steps I used to reproduce.

1) Browse a decklist. Has to be editable, so I'm guessing this only works with one's own decklists.
2) Click the Inventory or Wishlist count for one of the cards.
3) Click Apply.
4) New column appears.

Before and After pics.