Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/MicroDexed/src/commit/0e9377b1cae5cf1a2b3933070d61ce17332dd5da/third-party/ArduinoJson/examples/StringExample You should set ROOT_URL correctly, otherwise the web may not work correctly.

Holger Wirtz a0d3fee52f Added new ArduinoJson library. ... Disabled drum menus when drums not enabled. Replaced all strcpy(),strncpy(),strcat(),strncat() against strlcpy()/strlcat.		3 years ago
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StringExample.ino	Added new ArduinoJson library.	3 years ago