Info from Worldpay's FAQ (click here for a direct link): Quote:
A Warning indicates a greater level of doubt concerning the transaction than does a Caution, and is based on a significant discrepancy in:
the billing address details and/or
a Card Security Code mismatch and/or
an unusual pattern of shopping activity (e.g. a higher rate of purchases containing the same shopper or card detail than we would normally expect)
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So it seems that maybe you made an error when filling in your data?