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I think you have more than one audio plugin on your site that is interferring with the miniAudioPlayer.
But if you don’t give me an URL where I can see the issue I can’t help you.
Bye,
Matteo

As supposed your theme is instancing its audio player on the hidden <audio> tag generated by the miniAudioPlayer plugin.
You can easily solve this by setting the generated element as hidden via CSS:

write this in your style.css file:

.mejs-container{
  display:none;
}

Bye,
M