Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/FixedPointsArduino/blame/commit/8a8aae6afa372c560a22f5ca425a8a99120c918f/library.properties
You should set ROOT_URL correctly, otherwise the web may not work correctly.