I have disabled all cache. server, Joomla and browser.
The cart still adds additional tax during checkout.
The price for the photobooth in the backend is entered excluding tax (778.26). The price displays in the front end including tax (895.00). which is great. Then when you add to cart and go to the checkout and select New Zealand as the Shipping Address an additional 15% tax is added. NOT GOOD.
The subtotal displays including tax. GOOD
The Tax amount should be $116.74
The Total amount should then be $895.00
Also, when I add another item to the cart it does NOT appear in the cart or checkout.
You say it is a cache issue but all caches have been cleared and disabled.