6 minutes ago, Crezzur said:It should work for Prestashop 1.7.7 if you want we can have a look at it, there are no settings in Prestashop that changes this behaviour.
I am guessing a custom module is causing a javascript error which blocks the javascript hover function to work correctly.
how can we do to check?
I add something to confirm what you say: some sub-categories on the desktop side (not all) if selected they return an empty category and instead they have products inside. example this: https://www.thzinformatica.it/41-ricondizionati-computer