Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/fe9a5c8167e253d38b3a1b2b9c7be7269f30028c/doc/images/MicroDexed_Panel/Transparent%20images/Rotate%201/Volume%20Right.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.