That's a mix of FLUB (which won't happen with 1 other passenger) and a display issue. Try using the App if you are using the website, or the website if using the App. And/or leave it a few days. The website version can be reached on the App via the More Details link at the bottom of the panel. Or call up. However as you will appreciate, seat selection probably isn't your greatest priority at the moment, you can leave it until you walk into a near empty cabin.