Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/b7c870081c3dcd2751277c3b77084e9cb7e804fc/mkdocs/images/ac_auxjoin_multi.svg
You should set ROOT_URL correctly, otherwise the web may not work correctly.