The total amount you’re seeing is just the total amount of the customer’s transactions (11000 + 3300 = 14300). This report will always show the total amount of all the customer’s invoices, quotes and payments. What you need to check is the customer’s balance which will be showing on the upper right corner of the screen. This balance refers to the unpaid invoice you’ve created.
You can also open the quote transaction to check the remaining subtotal and check the invoiced subtotal.