Animation bug on Aether wing kayle

I recently started playing kayle with my Aether wing skin and i noticed that her sword violently vibrates when using her Taunt, Joke and Dance. No problem with the Laugh animation

During the animations her sword vibrates "all over the place" when it's not supposed to

not sure if it's also for her other skins..

when we are on the subject a friend informed me that it also seems to be happening on Leona (poolparty skin i think it was)