Pounce Incorrect Mana Usage

Noticed pounce was taking up about half my total mana when used.

So I checked out the skill and i says that it has a 51 mana cost, but when doing the skill in my hideout I can see that my mana goes from 310 all the way down to 200 mana.

So there must be a bug that either the skill costs double or the UI is showing an incorrect number.