I reloaded the page and it works fine now.
EDIT: Goat Horn does not seem to count as an item to the codex.
EDIT: Sometimes it subtracts the amount that you brought in from your gold total, and sometimes it doesn't (on the victory screen).
EDIT: The item lottery tab sticks out below the class tab and onto the kingdom gold thing in the goat glade. It just looks a bit strange.