I sent in a ticket about this 'bug' and they responded the same day but with just a "thank you for bringing this to our attention"... well i can't complain it's not like i expected an immediate solution anyway but i was suggested to share the problem on the forum as well so ya here you go.
Basically the Stormbringer skill "Moonblade" has an effect which reads "transforming reduces the cooldown to 1 second". What this means is you cast Moonblade then transform using Reaper Form and Moonblade is now effectively refreshed and ready to cast again. It's a one time trick for burst damage.
I have asked several other Stormbringers if that effect is working for them and they tested it for me and yes it did work that way for them. When i do this though, Moonblade's cooldown is unchanged. thats the bug. I dont get to use the cool trick QQ
... anyone else having this problem?