Hey there.
According to the blue post at https://us.forums.blizzard.com/en/wow/t/season-of-discovery-class-tuning-incoming-february-20/1788506 the mage conjure water spell was supposed to give a full stack of 20 water after the weekly maintenance. It currently gives 10 per cast instead of the full stack of 20 described in the bluepost linked. While yes this is nitpicky I was just wondering what happened.