[Gameplay] Singed fling bug

I played a game as singed (just one) and his fling was bugged. About 50% of the time it would simply bump them in a random direction even forward a short distance. I have not tried playing singed again but it was this match. I dont have any video software so i didnt record it :( (http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/1748296330/206215309)

Edit: Found a recording software. In the video at 20s brand is flung in the wrong direction. https://www.youtube.com/watch?v=H6BxCZ14EkI&feature=youtu.be