Did you bring your own wine onboard? If so there will be a corkage fee unless you have a drinks package - even in the retreat. From their website
“When consumed in a shipboard restaurant, bar or dining venue, each bottle shall be subject to a corkage fee of $25. Corkage fees do not apply to guests who have a Classic or Premium Beverage Package.”
https://www.celebritycruises.com/int/faqs/faq-fragments/enjoying-your-cruise-fragments/beverage-packages