first time using the ambassador free weekend night certificate....had a question here for people who have used them before....

just booked 2 nights at the ic in istanbul....the first night is available at €182 but my confirmation email says the total estimated charges would be €416 for the 2 nights....when i present the certificate then i should only be charged €182, correct????is it normal for the email to read that way or do i need to call the ambassador service to get the rate corrected????