Bug with Ekko's E

While using ekko's E, after the tumble semi-frequently it will auto click and send me to the nearest target in range. I don't believe this is a mouse problem as I haven't noticed any other auto casts on any other ability of his or any other champion I've played recently. I don't use quick cast and most of the time my mouse isn't anywhere near the target he blinks to. I've had my mouse hover over an enemy and it bounced me to a minion behind me and far away from my mouse. It doesn't happen instantly upon cast so i don't think it is a double tap bug. It won't always happen but usually happens once or more for me during the course of an average game.