Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/222b6a4913d89e83db4d2408f6c9eecea141f68f/examples/mqttRSSI_FS
You should set ROOT_URL correctly, otherwise the web may not work correctly.