Hi,
That's a common issue with PayPal. There are two ways to avoid that:
- turn off the "send order details" setting of the PayPal payment method. That way, HikaShop will only send the total of the order, and not all the product information and thus PayPal won't calculate itself the total with its own way of rounding prices and it will always match.
- alternatively, you can turn on the "round prices during calculations" setting in the Hikashop configuration. That way, the prices will be rounded during the calculations, like PayPal does when it calculates the total, and thus it will reach the same total as HikaShop.