Several autoplaying Vimeo Embeds unmute all at once

Several auto-playing Vimeo Embeds that are on the same page play sounds simultaneously when only one of the embed videos is unmuted. See the issue here: chandlersimon.com/work/medtrack.

This is the custom code I’ve used for my video embeds:

<div style="padding:56.25% 0 0 0;position:relative;">
<iframe src="https://player.vimeo.com/video/398090399?autoplay=1&loop=1&autopause=0&muted=1" 
style="position:absolute;top:0;left:0;width:100%;height:100%;" 
frameborder="0" allow="autoplay; fullscreen" 
allowfullscreen></iframe></div>

Any help appreciated, thank you (Also this is my first forum post I hope I included all the right info!)