Why does this trend not display normally?

I have created this time series widget, which only displays once I got to configuration and saves (without change).
Once it is on screen, it runs normally, even in the background.
But as soon as I leave the Web page, and return, I have to call configuration for the widget an save, elst the widget remains blank.

This unwanted behviour occurs on several browser types (Firefox, Safari, Edge identically.

Thank you for considering

Hi @rin67630, please, send me a PM with your user account.