Galio bug with Darius

In my last game as Galio, both teams noticed that when I ulted Darius, there was no effect. He kept running in the same direction he was headed previously to my ult without being taunted. He was using dunkmaster darius skin and I was using gatekeeper galio. My ult worked on every other champion on the enemy team the way it was supposed to. I ulted darius more than once in the same game and got the same bug.