Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/73a3a4020b06ab0bbcbcd1a39c669d8f846a6288/doc/images/MicroDexed_Panel/Transparent%20images/Horizontal%20Arrows/Horizontal%20arrow%20Red%20right.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.