Order/Invoice: Item total result diff total result

In some cases the order total is not correct:

net price: €1.273
10% sales tax: € 0.127
quantity: 1
grand total: € 1.40

Now taking the same product and adding it with two order lines:

grand total: € 2.79

Right now the grand total is calculated by total all item net prices, total all adjustments and finally adding those two values together.

The following screenshots are taken from the orderview. Ofbiz request a payment of € 2.80 but will create an invoice with a grand total of € 2.79.

Heres the result with just one orderline:

I have created a XML file for testing.  Import the file via XML import and create an order:
partyId: AUT_CUSTOMER
productStore: Test GmbH
product 1: AUT_PRODUCT (quantity 1)
product 1: AUT_PRODUCT_CP (quantity 1)

Checkout with default settings.

From my perspective the calculation should be changed to calculate the total amount for each line and calculate the grand total from these results.