Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/OpenAudio_ArduinoLibrary/src/commit/fd31e3974e488e588405b51013e3a590b861f535/docs/jquery/css
You should set ROOT_URL correctly, otherwise the web may not work correctly.
Chip Audette