Desolation Twin (BFZ) and Ulamog, the Ceaseless Hunger (BFZ) have a cost of 10 colorless mana. While they sort properly, what Deckbox shows in the cost column is odd. It looks like 1 colorless plus 0 colorless as displayed, in other words the digits 1 and 0 are separated out into their own bubbles. It would look much, much better if those cards had the 10-colorless graphic like Aladdin's Lamp (Revised). It's not a problem with all recent two-digit costs, since It That Betrays (ZvE duel deck) has a 12-colorless bubble.

Fixed them now, thanks for reporting!