Hey, I've been playing for almost two weeks and experienced this bug sometimes, especially when i'm crafting.
So, whenever I buy large amounts (100, 200, 350) of crafting materials, like Acidic Salts, Smelly Glue, etc etc, the price doesn't follow up.
Today i've bought 250 Acidic Salts for 75 gold, the real price was more than 3 silver i think.
I still don't know what specifically trigger this bug, i believe it happens when i add zeroes after the '1' that is in the numeric spot.
I hope this help you guys figure out what trigger this bug.
BTW, awesome game Hunted Cow, awesome game.