the + and - buttons do not work in the quantity of products

-- url of the page with the problem -- : liberarmonia.com/index.php/shop/product/1-stars-watches
-- HikaShop version -- : 4.4.5
-- Joomla version -- : 3.10.6
-- PHP version -- : 7.3
-- Error-message(debug-mod must be tuned on) -- : the + and - buttons do not work in the quantity of products
I can't find the problem!
Thank you in advance!

the + and - buttons do not work in the quantity of products
I can't find the problem!
Thank you in advance!

Hi,

Your website requires to connect with a user account to be able to see that page:
i.imgur.com/6gComYd.png
So I couldn't look at the problem. Could you provide a test user account ?