The total price of items in cart is incorrect while using 21% of VAT.
The image bellow shows an example of the issue (77.99€ instead of 78€) in a fresh Plone installation.
Example:

The net price used for the above items was:
- "CJPpas": 6,611€
- "6 t/m 17 jaar": 1,652€
- "Volvassenen": 10,33€
Any ideas what is causing this problem?