It's been a while since I've read up on it, but as I recall, Syria was also turning over stockpiles of potentially weaponizable industrial chemicals. That may be where the discrepancy is here.

EDIT:

Some more reading suggests that they're actually being shipped to Italy for storage to get them out of Syria ASAP, and then the actual processing/destruction is occurring in international waters.

http://en.wikipedia.org/wiki/Destruction_of_Syria%27s_chemic...