Kayle Attack Speed and Ult Bug

In a recent game against a Fiora top lane and Yi jungle, I played Kayle. Throughout the game things seemed OK, however when being attacked I activate my Ult on myself and my lovely E to increase my range and attack speed. I was building life steal and attack speed build. There was a bug though, whether it was a combination of fiora ulting me and yi's q on me, when I ult and activated my e suddenly my attack speed was gone and the game glitched. This happened repeatedly throughout the game and whenever fiora ulted Kayle or Yi activated his Q on Kayle while Kayle had her ult on herself. The attack speed was gone and Kayle glitched.