Question / Help Browser Audio automatically unmutes at random

I'm Livestreaming some zoom calls through OBS. The Zoom call audio is sent to the built-in output and OBS is set to pull audio from that output as well with an Audio Output Capture. In the background, I have the Vimeo preview page open in Google Chrome. The preview window is muted and there is no audio being streamed from it until, randomly about 20 minutes into a zoom call, OBS or something decides to start pulling audio from that preview window. No one is even at the computer when this happens so nothing is being changed manually. When I check the preview window it is still muted. The only way to stop the endless echo in the live stream is to close that preview window or mute the Chrome tab. Is anyone else having this problem? I figured out how to fix it but I'd like to understand why it might be happening.
 
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