Hi,
Thanks for the accesses.
I think I know what is the issue.
It must come from the line:
<input type="hidden" name="add" value="<?php !$this->config->get('synchronized_add_to_cart', 1); ?>"/>
which should be:
<input type="hidden" name="add" value="<?php !$this->config->get('synchronized_add_to_cart', 0); ?>"/>
in the file components/com_hikashop/views/product/tmpl/add_to_cart_listing.php
Because of that, as long as you don't save once the configuration page with that setting "Synchronized add to cart" turned off, this piece of the code will think that the setting is activated and thus the add to cart on listings will try to replace the quantity of the product in the cart instead of adding to it.
So you have three solutions:
- save the HikaShop configuration once
- change that line of code
- download HikaShop's latest version install package on our website and install it on yours to get the patch.