Hi,
I also have an issue with rounded numbers. Prestashop 1.7.6.1 using "Round up to nearest value" "Number of decimals: 0".
In product pages the price is show ok, like 18,00. The problem is, when a client click "Add to cart" in the windows that pops-up, right under the item the not-rounded price is displayed. Then also in the email that the client receives with that table containing his order, the Prier per Unit is displayed as not-rounded price. And because of this we are still unable to go live with the shop. Anybody have any idea on how to fix this? Thanks