Sona Ult

Gameplay bug with sona ult, playing TT hexakill I used my ult in two large teamfights with at least 8+ people present and I cast my ult. The sound animation played and it went on CD however no visual animation took place and no one got stunned. Both times I was atleast to hit minimum 3 people. I was able to use it to effect vs 1-2 targets without issue.