The Brewing Storm request

I finished the brewing storm request from Lukan, but I do not get any rewards, exp and the stormbreaker badges even do not lost.

 

1) did you return to the right npc?
2) do you have 4 empty slots in ur inventory?

 

Yes, it reveals that I completed. When I talked with the NPC, he didn't say anything or ask me have 4 empty slots. Usually if I do not have enough slots, it would ask me, but this time nothing appear and the quest completed...