I decided to write about this again because some people said it's the software's problem because it happens every time it's open only.
Whenever I open Musescore on Manjaro OS, the sound seems to stay 2-4 seconds behind my actions and the monitor. It affects everything else that has to do with sound and sometimes you can also hear white noise when Discord is open along with it. Bizarre right? The white noise would occur in Ubuntu too but it would fix after a period of having Musescore open...
I'm really not sure what causes it... And Manjaro said that it downloaded all dependencies that Musescore required.