Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/687ac28cbcf8e988af5153d0787141b37d5679eb/third-party/TeensyVariablePlayback/extras
You should set ROOT_URL correctly, otherwise the web may not work correctly.