When you place an order with us, a pending charge is placed on the card to authorize the account for purchase - this charge will disappear within a few days. The actual charge will not be captured and money will not be withdrawn from your account until all items have shipped, and tracking has been entered into the order.
This sometimes confuses people and looks like your card has been charged twice. The authorized charge should disappear from your account after a few days.
If you believe there is an error, please contact customer service immediately.