Seriously if you are going to limit available characters then set it based on time played or from max level to low. What is going on with not letting me access all my 120s? Hell I can post on a character I deleted ages ago, and not my Blood Elf Paladin.
Never been Logged in Character, and not my Paladin.
Have you tried logging out and back into the website, switching characters and doing the same, or clearing browser cache? If that doesn’t work, the forums/armory websites have been buggy the past few days with similar complaints.