I was distilling some potatoes today when I noticed that on two occasions, the number of potatoes that went into the still was more than the number I had selected. Most notably, I attempted to put in my last 18 potatoes and it said I had inserted 22. Is this a bug, or an intentional bonus (perhaps from an upgrade card I don't remember getting)? Also, I didn't have time to do the calculations to see how many units were actually added, so it could just be a problem with the message itself. I really don't know.