Usually a mesh that hangs in the air after being dropped has the wrong type of collision, or perhaps even no collision at all. I'd lean toward the latter if you can't activate it again once you've dropped it.
The ff0713f8 reference is a normal occurrence. All items dropped from your inventory get something starting with FF as a reference. The FF index is assigned to the save.
Thanks Arthmoor. That explains problems I've had before trying to get FormIDs. I knew that "ff" was assigned to vanilla items—I guess tha would logically include saves.
It's not game-breaking but i guess Drkrder can take note. Since I have played a bit after dropping it I didn't want to go back to get it. So I just loaded a previous save, got the ID while it was still in inventory and spawned another.