Hi,
Thank you for those details, they helped a lot to identify the issue.
The 404 comes from a request to a URL like glass-containers/null&limitstart=0&...
The null in the URL means that a data-refresh-url attribute is missing from one of the filter refresh areas in the HTML.
This typically happens when you have a Joomla template override for HikaShop listing or filter views that is based on an older version of HikaShop. The data-refresh-url and data-use-url attributes on the product listing div were added in a more recent version, and an outdated template override would not include them.
Could you check if your Joomla template has view overrides for HikaShop? You can look in your template folder at:
`templates/YOUR_TEMPLATE/html/com_hikashop/product/listing.php`
or
`templates/YOUR_TEMPLATE/html/com_hikashop/product/filter.php`
If those files exist, they are overriding the default HikaShop views. You can either update them to match the current HikaShop version, or rename/remove them temporarily to confirm that this fixes the 404 issue.