design – elementor no-repeat css value works randomly on unique single post template

I’m working on our WP website with elementor pro template builder. I have one single post template that I’m using for all the posts. The background “hero” image of the header section is the featured image of the post.

In the following post (with firefox/Chrome Mac) no-repeat value doesn’t work:
https://dev.mkorke.net/patagonie/centolla/

In the following post (with firefox/Chrome Mac) no-repeat value does work:
https://dev.mkorke.net/argentine/ocelot-ou-leopardus-pardadis/

Both examples supposedly use the same single post template with background values as:
…background-image: url(“photograph.jpg”);
min-height: 60%;
background-position: center;
background-repeat: no-repeat;
background-size: cover;…

In the single post template, if I change the value to default then back to no-repeat, it works again, … until it doesn’t.

What am I missing. Thanks for the help