What you may be seeing are not charges to your account, but temporary authorization holds placed due to multiple attempts to place the order that failed. This may happen because of incorrect information used when placing the order (incorrect billing information), hiccups in the processing, or a bank issue in the instance of protecting your card from fraud.
Authorization holds generally disappear from your account within 3-5 business days of being placed, depending on your financial institution.
If you'd like us to provide further detail please supply us with the email address used for the order(s), and we would be happy to look into this matter for you!