This might not be a bug but thought i would report it anyways.
When you take Ward drought rather than getting 30% more ward retention on potion use its multiplying current ward retention by 1.3 and you can get really broken numbers this way. There is a mage talent called “Warden” which has the same warding minus the potion use part and it only adds 10% to my current ward retention; just seems odd that both are worded the same yet calculating differently.