Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/7a0f3106f49b3ff94f255d51db3a1787bed2a84e/doc/manuals/MicroDexed-Build_Manual/images/100.jpg
You should set ROOT_URL correctly, otherwise the web may not work correctly.