Pro Moves D'Va talent bug/typo

For the talent Pro Moves

Each time D.Va’s Mech takes damage, its movement speed is increased by 2% and gains 2 Armor, stacking up to 15 times. Stacks of this effect decay every .5 seconds.

Basic Attacks in Pilot Mode against enemy Heroes reduce the cooldown of Call Mech by 1 additional second.

At 15 stacks, D’Va gets 20 armour and 30% movespeed when she should be getting 30 armour. However according to the PTR patch notes, she is only supposed to be getting a max of 10 stacks and the in-game talent description could be wrong.