Audio Error with Pyke Highlight

So yesterday I was playing an Aram with a friend when I managed to chain 5 ults in a row on Pyke for a Pentakill which I was super stoked about, and did record a highlight.

My problem is that in the highlight video the moment I cast my ultimate (meaning you'd first hear the sound from it) all audio for the entire highlight then cancels out. I am wondering if there is a way to somehow fix this as I'd really love to save this video all of the audio with it.

To be more specific about the problem: The highlight begins with me spawning at the right side of the map spawn point, I get near our inhibitor before starting a chain of ultimate casts, but literally the exact moment my first ult is cast, the audio for the remainder of the highlight is silent. Like I'd be inclined to say there is an error with the sound generated by Pyke's ultimate that then causes further audio to be blocked from being heard. Strangely enough everything can be heard perfectly fine while watching the entire replay of the game via the in-game client.

Any help to resolve would be much appreciated.