Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/828cf443c6db6e174667db794f398c993008a635/third-party/Bounce2/docs/files/sync_off.png
You should set ROOT_URL correctly, otherwise the web may not work correctly.
