Are you talking about Kagura's umbrella? Or Kimmy's aim?
Please elaborate more because I don't use either of these heroes so I'm not as clear on what you're talking about. I only heard these hearsay from other players.
I think there is some bug in kimmy because when I use skill 1 and shoot I will usually be 180 degree reversed. For example, if i am facing forward and shooting, then I open skill 1 and shoot then suddenly I am facing backward and shooting.