Kitchen-screen orders that came back after the bill was paid

The problem

Orders reappeared on the kitchen screen minutes or hours after they were served and paid.

What I found

• It was not the network. Two kitchen screens shared product categories.
• When one station tapped a ticket, Odoo split it in two, and the copy reappeared on the other screen.
• Splits went from 0–58 a day to 125–357 a day after the second screen was added, and every late ticket in the sample was a split.

What I did

• Changed the module so a tap moves the whole card.
• Added tests that fail if a future Odoo update changes that behaviour.
• Deployed at midnight, when trade is under one order an hour.