Not to worry, I'm here to make sure your QuickBooks balance matches with your bank statement, @ClareJoghee.
You may have created added the transaction instead of matching it with the one that you entered manually, causing it to have a duplicate entry. I'd suggest checking your bank registers within that period. You can use the search tools to locate duplicates. If verified, delete the other one by selecting the Delete option at the bottom.
- Navigate to the Accounting menu and select Chart of Accounts.
- Locate your bank and click View register.
- Use the fields on the Filter panel to choose the appropriate Transaction Type, Payee, or Date filter to narrow down the results.
- Select Apply.
- To delete the duplicate, click the transaction and select Delete.
- Click Yes to confirm.
Refer to this link for more details: Find, Review, and Edit Transactions in Account Registers.
You can read through these articles to learn more about managing your downloaded bank transactions in QuickBooks:
You can also check our guide on handling a customer credit or overpayment in QuickBooks Online for your benefit. It has the detailed steps on how to use the credit toward an invoice, refund the customer, or enter the overpayment as a tip in QuickBooks.
Please let me know if you need further assistance with this banking issue. I'm determined to help you succeed. Have a good one.