Whenever a potion is created, you can create up to 3 potions at once. The issue is that when a potion is brewed, all 3 potions have the equivalent value of the original ingredients, tripling the amount of EMC you can get from the process. For example: an awkward potion is worth 26 EMC and a magma cream is worth 792. Together this is 818, which is the cost of the resulting fire resistance potion. Since you can create 3 fire resistance potions, the potions together are all worth 2454 EMC, which is way more than the cost of the ingredients. The way to fix this would be to divide all potion EMC values by 3.