The admin side deliberately includes dates outside the kitchen's enabled weekdays when they already have orders — for example dates ordered before you changed the weekdays, or orders placed by staff through Checkout-As. This prevents orders from vanishing from the dashboard and reports. This checkout check looks across every kitchen location for that date, not just the one you're viewing, so a date can also appear because a different kitchen has orders on it. Customers, on the other hand, only ever see dates on enabled weekdays. Once those legacy orders are fulfilled and the date is finished, it stops being selected as the default dashboard date.