Hi Dominik,
Welcome to the forum, and thanks for your report!
That’s actually not a bug, but how it currently works, see: WIP: How to transfer bricks-frontend-inline-inline-css styles to a file? - #18 by timmse
We are still working on moving class styles to a separate file instead of outputting them inline, and will update the linked thread once it has been implemented.
Best regards,
timmse