Scroll down... there are two versions of the special fares chart. One when fare data information is available and one when the data is unavailable. You got the bottom table for that flight - "data unavailable". Certain booking methods will usually use the top special fare table, but it's entirely possible any fare could use the bottom one. It's unclear what triggers this, but from what I've read and experienced, it's usually something unusual with the booking such as manual changes to the flight or simply a glitch and the necessary information didn't get processed by AA's system.