Staff skin among others do not have those trails. I am glad for this as the staff and rifle skins (got 4 rifles in a row actually (lame)) look better than the short-bow I got that does have the trails IMHO.
Just saying
Yah, but I think that it’s the trail that makes them so unique! Elementalists always move their staff around a lot while casting spells, just imagine how cool it’d look if it had that trail effect! I don’t know, though. I’m not even sure whether it’s a bug or not. Perhaps they were intended to lack the trail effect.