Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/2ac5baba4835d9c5b3380efd07ca0752eca5296e/doc/images/LCD_characters_green/ladder6.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.