The Shaman AA: Call of the Ancients is bugged (simple typo?) for the first 6 ranks (and counting). It is known to be accurate for the top tank. Some time between, the typo/bug is corrected. Rank #1 description says it heals for 635. It actually heals for 135. Rank #2 description says it heals for 645. It actually heals for 145. Rank #3 description says it heals for 655. It actually heals for 155. Rank #4 description says it heals for 665. It actually heals for 165. Rank #5 description says it heals for 675. It actually heals for 175. Rank #6 description says it heals for 685. It actually heals for 185. Noticed on Coirnav. Max Rank confirmed by a live server shaman.
You're right that the description is wrong, Dzarn is planning to revamp the ward AAs so I think it'll get updated at that time.