Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/1d2ed1fd48dd2e564cd110c5bba79621b0f1d0c8/third-party/Bounce2/docs/files/tab_s.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.