This is kind of an OK/Cancel-type of issue.
When full of leves and you try to receive another, the UI prompts you to select a leve to return to the counter in order to claim the new one. After selecting a leve to return, the level description window appears. The button labels are "Accept" and "Return". "Return" in this case means "Cancel the request", not "Return the leve". The wording is ambiguous.