Variant price increases the unit price when the number of units increases

-- url of the page with the problem -- : www.hollebollegijs.eu/winkelwagen/cart/show/cid-27201
-- HikaShop version -- : 6.1.1
-- Joomla version -- : 5.4.0
-- PHP version -- : 8.3.27
-- Browser(s) name and version -- : Firefox 145.0.2

When the customer increases the number of items in the shopping cart, the system increases the unit price by the amount of the variant price.
The total price is displayed correctly.

Hi,

This looks like a bug. Could you provide:
- a backend access to that website in order to check its settings
- a FTP access for that website in order to do some debugging
- the URL of that Gezond product so that we can replicate the problem
via our contact form ?
www.hikashop.com/support/contact-us.html
This way we can look into the issue and provide the necessary patch.