Tryndamere ult does not respond to movement

I don't know if it was just me, but I encountered a bug on aram where whenever I used Undying Rage, I would try to run away from the enemy team but instead he responded by attacking the closest thing to him. Most of the time I was inside the Veigar field, but it bugged out even when I wasn't stunned. I don't know how to recreate it as it happened randomly, but hopefully it's only an aram bug.