header images visualization in mobile devices - betheme

I can't find into the ducumentation a way to display correctly header images, even if I use images with dimensione same as present in template demo
please see on desktop and mobile this page 
https://www.sassuvini.it/it/portfolio-item/binacosassu/
results are in pc
image
and mobile
image

so the image is not resized in any way

thanks for your support

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