Problem with live rates

Hello,

I’m using this plugin for a client. The website itself isn’t visible yet, because the shipping rates are not correct. For example, shipping (standard) from the shippers adres in the Netherlands to an adress in Belgium is 5,92 euro, but on the website the rates are 22.82 euro. How can I fix this problem?

(In the plugin settings the unit number is correct)

Thanks in advance.

<?xml version="1.0"?>
<RatingServiceSelectionRequest xml:lang="en-US">
  <Request>
    <TransactionReference/>
    <RequestAction>Rate</RequestAction>
    <RequestOption>Shop</RequestOption>
  </Request>
  <PickupType>
    <Code>01</Code>
    <Description/>
  </PickupType>
  <Shipment>
    <Service>
      <Code>03</Code>
      <Description/>
    </Service>
    <Shipper>
      <ShipperNumber>RR5593</ShipperNumber>
      <Address>
        <AddressLine1>Industrieweg ..</AddressLine1>
        <City>Zierikzee</City>
        <PostalCode>4301 RS</PostalCode>
        <CountryCode>NL</CountryCode>
      </Address>
    </Shipper>
    <ShipFrom>
      <Address>
        <AddressLine1>Industrieweg ..</AddressLine1>
        <City>Zierikzee</City>
        <PostalCode>4301 RS</PostalCode>
        <CountryCode>NL</CountryCode>
      </Address>
    </ShipFrom>
    <ShipTo>
      <Name/>
      <CompanyName/>
      <AttentionName/>
      <Address>
        <AddressLine1>Koningin Astridplein 27</AddressLine1>
        <City>Antwerpen</City>
        <PostalCode>2018</PostalCode>
        <CountryCode>BE</CountryCode>
      </Address>
    </ShipTo>
    <RateInformation>
      <NegotiatedRatesIndicator/>
    </RateInformation>
    <Package>
      <PackagingType>
        <Code>02</Code>
        <Description/>
      </PackagingType>
      <PackageWeight>
        <Weight>0.25</Weight>
        <UnitOfMeasurement>
          <Code>KGS</Code>
          <Description/>
        </UnitOfMeasurement>
      </PackageWeight>
      <PackageServiceOptions/>
    </Package>
    <ShipmentServiceOptions/>
  </Shipment>
</RatingServiceSelectionRequest>