The amount appearing on your bank account/credit card is an 'authorization of payment' where the bank checks if the card has enough available funds. If an incorrect CCV or Zip Code is entered during the checkout process, the charge will be declined but an authorization will still appear on your bank statement.
These charges are only pending. Most banks drop the charge within a couple hours or few days, but some can take up to 30 days. No money is actually debited from your account. So if you have $1,000 in your account and have a pending authorization charge from us for $50, you will still have $1,000 in your bank account. That charge is only pending and will be removed within a few days or so, depending on your bank.
If you want the pending charge to be removed immediately, try contacting your bank/credit card issuer to see if they can actually remove those pending charges. There is nothing The HYV or Shopify can do to remove that authorization of payment.