Kindler card not "catching"

Occasionally, when I have to play may mage's Kindler trait card, I click on it, and it goes through the usual attachment animation, but it doesn't disappear from my hand of cards, and I have to click on it again.

 

...you drew another one.

When you play a trait, you get to immediately draw another card.

 

Ah, okay, thanks. Didn't catch that (obviously).