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Hi,

That would indicate that there is a javascript error on the page.
It's probably caused by another extension.
But I can't provide a solution without looking at the page in order to anaylze the javascript on it.
Could you provide a link to a page with the problem ?

Hi,

You have that javascript error:
chiudi-cancello-compatto-abbinato-a-cardine-inferiore.html:913 Uncaught TypeError: Cannot read property 'click' of null
And that comes from the fact that the hikashop_first_thumbnail id has been removed around each first thumbnail (it's there by default in HikaShop) and I can see that the HTML there on your page is different from that.
So it's a customization issue. I suppose that you, or your template provider, has customized the file "show_block_img" via the menu Display>Views but didn't properly handle the changes in the javascript used to handle the images at the bottom of the view file.