LVGL log lines printed twice on Serial monitor

I’m starting to learn about LVGL and CYD.
In my current sketch (based on LVGL (Light Versatile Graphics Library) ESP32 Cheap Yellow Display (ESP32-2432S028R) | Random Nerd Tutorials) I notice that all log statements are printed twice in the Arduine IDE Serial monitor. No big deal, but I wonder why…
There is only one “LV_LOG_USER(some string)” statement in the code.