What you may be seeing are not charges to your account, but temporary authorization holds placed due to multiple attempts to place the order. This may happen because of incorrect information used when placing the order, 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. If you'd like us to investigate the situation further, please supply us with the name on the card and the last 4 digits of the card number, and we would be happy to look into this matter for you!