Hello Jeremy,
Your card was declined due to failing the address verification system. Usually this happens when the billing address attached to your card does not match what the bank has on file. What you are seeing is not a charge, it is an authorization. When you tried to place the order you bank was pinged to make sure the card was valid. When this happens most banks will put a temporary hold on the funds, which can look like a pending transaction on your end. Because the card was declined we cannot finalize that authorization. If not finalized authorizations expire and the holds are released. How long that takes is entirely up to your bank and not something we can control.