I was a victim of the Trainable Spell Bug. It cost me 1700 crowns to fix. If you move the down arrow on your keyyboard the trainable spell highlight changes.
KI needs to insert the spell name into their ":are you sure you want this spell" page as a double check in those instances. I am not happy about the way that it handles the training point buyback for crowns instead of gold. Most other systems WOW included do training point buyback in in-game currency,