Although it doesn’t happen often, there might be times when you spot two charges on your account. If that ever happens, don’t worry—there are a couple of simple explanations for this.
Shadow payments
When this does happen the most common thing you’re seeing is likely a "shadow payment." This means the payment either hasn’t actually been taken from your bank or, if it has, it’ll bounce back into your account within a few days. This can occasionally happen during payment authorisation, where instead of capturing the initial authorisation, a new charge is created for the final amount.
Rest assured, the authorisation charge will drop off within a few days and be returned to your account.