Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/477445e0d01b3792e5c8d2bbe987f6cee04da738/third-party/LCDMenuLib2/examples/01_backend
You should set ROOT_URL correctly, otherwise the web may not work correctly.