hikashop cart module issue

-- url of the page with the problem -- : www.aroma-massage.it

hi all, I've been having several problems these days.
The hikashop module checkout module behaves abnormally.

If I add a product to the cart, the form notifies me that the product has been inserted, but if I then navigate to other pages, the product is no longer there.

Secondly, if I go to the homepage it keeps in my memory an old cart with products (from a previous test in which I had added products to the cart) and if I click on the X to delete it doesn't do it.

I also tried clearing the cache and so on but the problem persists. (I wanted to upload a video but can't).

i think i figured out that the problem is jch optimization and cache management, but i can't fix it. I have excluded the modules and hikashop from the jch cache but the problem persists.

Suggestions?

yes i'm sure it's a cache problem with jch too...
the form is bound to all pages so i should turn off the cache of all pages but that would be a problem..

I just have to talk to jch..
Or I was thinking of disabling the jch pagecache and activating the joomla one by setting it to not cache the whole page.. what do you say? It might work?