Could be your mics sensitivity if its picking up inaccurate levels.
I was thinking that that was the case until I realized that the glitch was occurring when other players were speaking. My bad for not mentioning that pretty important aspect.
On the other note, I was planning to do that, but then I was unexpectedly teleported to a new server (I’ve seen it happen to other players, possibly as a result of lag, but that’s just my guess) and the game could no longer detect my microphone. I’ve already restarted my computer several times, but it’s still not working well, and changing any of my settings doesn’t help. I’ll try to describe it a little better though: If I’m not talking, then the microphone icon appears grayed out. But if I make any sort of noise whatsoever, the icon randomly changes levels, regardless of my volume. Sorry that I can’t get a better video, that’s as good as I can describe it at the moment.