Taxes issue

Hey there,

Currently having issues with checkout using quickpay and woocommerce. I created a developer site where i disabled all but woocommerce, quickpay and changed the theme. (dev.reolux.dk)

When i want to fullfill my order, i get this error:
basket[0][vat_rate]: is invalid
does not have a valid value
shipping[vat_rate]: is invalid
does not have a valid value

If i remove the tax rate under woocommerce -> settings -> tax -> standard rates it goes though to the quickpay site. The rule is DK and rate is set to 25.0000.

Anyone else getting this error?

The page I need help with: [log in to see the link]