Thanks, this was very useful. You were right about the sold out slot: a slot with 0 units still "remembered" the old product and blocked the change. Fixed in the next version, together with the machine breakdown lock and the map button.
About the numbers: the "$/min" in the shop is (base price - cost) x sales per minute at the base speed of the product, without upgrades, demand or machine bonus. Your sushi: (27 - 18) x 1.8 sales/min = 16. In the machine you sell faster , so the real number is higher. And the 1.2: the coffee machine pays +20% on every sale. Now the machine card shows it.