Activated Ults keep ulting (Sound bug)

I've only played a few games of the new and improved TFT, but I've noticed some issues. When a champion uses an activated Ult, the sound sometimes doesn't stop and keeps playing even after the round is over. Furthermore, it seems that this doesn't just happen on your champion's ults, but also your enemies. I've had two instances of this happen so far, first when my Mundo wouldn't stop his ult sound even outside of combat, or even if I put him on the bench.

This happened a second time fighting someone with a Singed, where the Singed ult sound just kept going over and over, looping, even though I had no Singed and this certainly wasn't caused by me, but rather one enemy I fought one round. I tried turning my sound off and then on again, but that still didn't do anything to help the situation.