HEllo Oli,
there is a bug in the Post/Zip Codes Module. If the Delivery Charges are under 1,00 … like in our example 0,55 then in the orderpage it shows “kostenlose Lieferung” BUT adds the 0,55 !
So the Endprice is correct, but it doesn’t show up as the delivery charges price but instead as “kostenfreie Lieferung”.
If I change the delivery charges to 1,55 for example : Everything works fine.
Here are some screenshots – i hope they help to understand what i mean :

and the order screen:

Thx for your help!
Thomas