If you just placed an order within the past 3 days and you see multiple pending charging when looking at your card statement, don't worry! While you may see several pending charges, you will only be charged once for the order that went through. The reason you see multiple pending charges is because you attempted to submit the order multiple times, and your bank placed a temporary hold for each time you attempted to submit the order. Please allow 1-3 days (depending on your bank) for the pending charges to "fall off" and disappear.
If your order was not accepted and you still see pending charges, see My order was declined but my card was still charged.