playlist opens in mobile view on desktop-browser

my playlists open in the mobile view when i launch the website on a desktop browser.
and there is a difference between safari and firefox.
so it is never really clear which view is used.

you can look here:
https://headphonica.com/jan-grunfeld-ich-liebe-es/
it is in the spoiler ?tracklist / PLAY?

thanks.
tommy.

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