Volume bar bug with built-in audio player

I run this blog called Gentle Cuts:
https://www.gentlecuts.net

I have put an audio player beneath the song titles in the posts. Whenever I reload the page the volume bar jumps down beneath the player itself. If I change the width of the browser window or press play, the volume bar jumps to the right position (to the right of the player itself), as it should be.

Does anyone know what the problem with this might be? I’m thinking that this might have to do with the text being bigger than the default theme of the player. Maybe the text exceeds the height of the player and therefore creates this bug?