mix-up
noun
[ ˈmɪksʌp ]
• a confusion of one thing with another, or a misunderstanding or mistake that results in confusion.
• "there's a mix-up over the tickets"
• a combination of different things, especially one whose effect is inharmonious.
• "a ghastly mix-up of furniture styles"
mix up
• spoil the order or arrangement of a collection of things.
• "the papers got mixed up when they slid off her lap"
• confuse someone or something with another person or thing.
• "I'd got her mixed up with her sister"