Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/fcae604069a906ad06ba0eb4492e63fe634b90b4/third-party/ArduinoJson/examples/JsonGeneratorExample
You should set ROOT_URL correctly, otherwise the web may not work correctly.