It's good to have you again, @hlg2482

I'd be glad to help you out! If you happen to create multiple invoices for a specific customer, all of the payments made that show in the Account Summary will only reflect in the latest invoice you create. To make sure that you can see all of the transactions, you can also create and send a customer statement for more detailed information. 

Here's how:
 

1. Go to the Sales tab, then select Customers (Take me there).
2. Select the checkboxes for the customers you want to make statements for.
3. In the Batch actions dropdown ▼, select Create statements.
4. In the Statement Type dropdown ▼, select the customer statement type:
   • Balance Forward: Lists invoices and payments with outstanding balances for a specific date range.
   • Open Item: Lists all open, unpaid invoices from the last 365 days.
   • Transaction Statement: Lists all transactions for the selected date range.
5. Select the dates for the statements and the date range.
6. Review the customer's email addresses.
7. Select Save, Save and close, Save and send, or Print or Preview.
    

Tip: If you make changes to a transaction on a statement, the statement will automatically update to match.

For more information, you can visit this link: Create and send customer statements in QuickBooks Online.

I will also add an article that you can refer to for future use if you want to personalize and add info to your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.
 

Feel free to add a reply if you need further assistance with your account summary. Enjoy your day!