audio volume and skipping bug

just ran into a fairly serious bug, on one particular map in my game when i play in editor it causes all sounds to play simultaneously whilst skipping and increasing volume. imagine 500 CD players skipping on full volume.

it even feeds through to my web browser causing the same effect on whatever video im watching.

never seen or heard of this issue before, and it only happens on the one map, and in 4.24.3
my previous backup in 4.23.1 is fine