Quest has bugged and now I can't get the specialization for my rogue

So the quest with the alfa quillbacks has bugged on me. I could probably do another specialization quest but this is the only one that I'd actually like for my archer rogue. 

So you need to kill 3 alfa quilbacks for the ingredients of something and I've killed all 3 of them in their respective locations. Problem is that the first one I killed didn't drop any loot. This means I didn't get the ingredient and now I can't finish the quest since the alfas don't respawn.I've spent multiple hours trying to either find an alfa quillback or find the loot that the one I killed left behind. Literally hours. 

It's such a shame that I've had to do this since it's annoying me a great deal. The game is absolutely fantastic and I've had such a good time. Probably the best game I've played since Origins. Might be better or worse. We'll see when I "finish" it :D 

However, right now I can't get the specialization and I'm level 16.. This annoys me a lot. I might just go on without it :D Haven't given me any trouble yet so I guess it doesn't matter all that much.. 

Still, it's a bug and should be fixed. Could it be because the quest wasn't active at the time I killed the thing?  (I had the quest in my journal but it wasn't the active quest like it was with the two other kills where I actually got the loot.)

And yes, I've checked everything, I've been to the specified areas more times than I care to remember right now, and I've been everywhere else in the approach.. 

Hope you guys can do something 😉