For some reason, my first suspect is the world editor itself...
You probably didn't see it, but I also created a thread because I had some problems with a trigger that just.. didn't do what it was supposed to do (and it was 100% correct).
Mhh... I'll try reinstalling my warcraft, I kind of need the model :/
~Additional Info: (no, not a double post.. this actually contains valuable information -.-).
Someone else tried out the model for me and got the same result: the vial gets attached to nearby units, while the... whatever's inside stays where it's supposed to stay.
I suppose you could check what's wrong with it?
Well, I've never seen something like this before, so I don't have a clue what's wrong, but I'm not a modeller either