Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/blame/commit/5935ceaf58f688b1d0e580b40aed1a87a129e20f/library.properties
You should set ROOT_URL correctly, otherwise the web may not work correctly.
paragraph=A library for easy implementing the Web interface constituting the WLAN for ESP8266 WiFi connection. With this library to make a sketch which connects from ESP8266 to the access point at runtime by the web interface without hardcoded SSID and password.