The Chaos Behind Alfonse Green Glitch

Yeah, I had that same sort of glitch. I got the Syrup, went to Elma, then Elma took it and i never got it back. Then Ericsson said he could give me another since he still had some left. I tried to continue the quest again, and it stole my item again. Ericsson never gave me another quest for the Syrup so I was screwed.

So then I forfeited it. And after you forfeite the quest it will not allow you to regain it.
Sorry man.