Price Calculations plugin not working on product page

-- HikaShop version -- : 6.5.2
-- Joomla version -- : 6.1.3
-- PHP version -- : 8.3.33
-- Browser(s) name and version -- : Safari 26.5.2
-- Error-message(debug-mod must be tuned on) -- : Cannot see one.

Hi, I’ve purchased and installed the Price Calculations plugin to add a percentage markup on all unit prices. I’ve added – {price} * 1.2 – under ‘Formula’. The percentage markup has been added to the checkout and works correctly, but it’s not displaying/working on the product page unit price or total. I did see reference to the AJAX, but I’m not a developer, can you help to resolve this and point me in the right direction to fix this.
Many thanks
TCWS