noun
order mistake; getting an order wrong
Commonly used in restaurants, cafes, and retail for mistakes in taking or fulfilling a customer's order. Wasei-eigo: derived from English 'order miss'.
wasei-eigo (Japanese-coined English), from order miss
すみません、オーダーミスがあったみたいで、注文したものと違います。
Excuse me, there seems to have been an order mistake; this isn't what I ordered.
忙しい
Order mistakes are likely to happen during busy times.