Not a bug, but I think there is an error with the “translation” from the card game to the codingame challenge 
According to the first 4 basic spells, the order of the ingredients would be: blue < green < orange < yellow. But for the recipe and spells deck, the order is instead: blue < orange < green < yellow, so the green and orange ingredients have been swapped. For example we have :
deliveries.add(new DeliverySpell(new Recipe(1, 1, 3, 1), 16));
deliveries.add(new DeliverySpell(new Recipe(1, 3, 1, 1), 18));
Which shows that tier-1 ingredients are better than tier-2.
I think it will unbalance the game and make it less interesting at high level, so I would suggest to fix the spells and recipe decks.