Yowie passive ability not upgrading

[Iahwahska]

My Yowie on my mage Captaintrippz is level 15 but is still displaying his level 1 passive ability.
The Yowies I have on my other toons don't seem to be having this issue.

[Sorcerie]

Yowie learns a new skill every ten levels...

[Iahwahska]

Seriously? Isn't he legendary?