If I am understanding your situation correctly, you want to upgrade from a Sunset Veranda to a Concierge Cabin on the aft of the ship. However, you are comparing the current pricing of both categories. When you upgrade, you use the price you paid for your Sunset Veranda and the current price of the Concierge cabin to determine the difference you will pay. You compare the current price of the Concierge at $2650 to the price you paid for the Sunset Veranda, which I assume is less.