Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/blame/commit/00d4b1715522da5c37fe3451b5a16082b713fe9d/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.