Tempest Weapon

I am not sure if it is a bug or not but the gathering storm node ‘tempest weapon’ which gives flat spell damage per melee damage on equipped axe or mace seems to be bugged. The storm bolt tooltip does not scale with my equipped weapon. Unless there is some possible way of the melee strike portion of gathering storm to do spell damage (which fundamentally should not work) or the node is working but the tooltip does not reflect the actual damage? It is very confusing as i just spent quite a bit of time theory crafting a build just to find out it is seemingly useless. Please fix EHG.