Heimerdinger Urf BUG vs Sion and Yasuo

(IN GAME BUG) Whenever turrets get knocked up by any skills used by them, it stays in the air! I took some screen shots incase you wouldn't believe me. They act like a normal Heimer turrets except staying in the air. They attack, and die (that's normal). I was playing on a mac client with Yosemite. (Macbook Air)