@WolflexZ I'm playing in a laptop HP Victus 16. Normally I play with the speakers, but noticing that some sounds were too low , I tried playing with headphones, but nothing really changed. The headphones are not the problem, I can hear any other game/video just fine, so I only have the speakers left, but if you say you find the video completely normal, maybe I'm just being paranoid.
It is still difficult for me to listen to the zombies, which seems weird to me, because I didn't remember having this problem when I played years ago.