If the Billing Address on the order is different in any way from what is listed on file with the credit card issuing bank, the funds will be held aside until the correct address is given and the card is resubmitted for approval. The slightest difference such as number within a zip code or a street address can cause the address not to match. It is up to that particular bank to determine how long (3-7 business days) they hold the funds for each transaction submitted.
"Please note, funds will be held against a credit card for every transaction we submit on that card."