Old Google-maps shown correct, new maps not shown

after nearly one year i created new maps, using save as copy, and as new map, but new maps are shown as white space. Maps created some time ago still are displayed correctly.
The Firefox browser gives me this error message for maps on this page:

familie-abderhalden.ch/index.php/reisen/...-badeferien/hinreise

this site overrides Array.from() with an implementation that doesn't support iterables, which could cause Google Maps JavaScript API v3 to not work correctly. js:146:391

Installed is latest version of Joomla and ZHgooglemaps.
Have no idea what to change.......

In your map title there is single quote.
I don't know why it is not escaped on your site.
I tested on my site - it is correctly escaped.

Thank you, that singel quote blocked all 4 maps.
But now, I do not understand why the kml-files are not read / processed. They show good on GoogleEarth., and are in the same direcory as all other older good maps....

Give me direct link to map with KML file.

Probably your template override img tag width attribute or svg tag, and it cause not show it correctly