My laptop is only playing voices.

So, as I said in the title, when I'm like watching a video, or listen to music, for some reason, the sound of people talking or the singer singing plays out completely normally, but it doesn't play out stuff that aren't people's voice (ex: sound effects, instrumental music)
I've searched up if this happened to other people as well, but all the results that I found seemed to be that of the exact opposite situation (they can hear the music and sounds, but not the voice)
Oh and I also tried listening to it with a wired-headphone, and bluetooth-earbuds, with the earbuds being the only thing that played the audio perfectly fine. (I know, you may say "Oh maybe your headphones are broken?" but I checked with my sister's computer, and it works fine there.)
Does someone here know how to fix this?