Each sales invoice was for 1500.00 plus the tax, for a total of 1724.61 each (your tax number was off). So the total account receivable for this customer should be 3449.22. Yet somehow, each sales invoice was for 1724.63. We’ll come back to that discrepancy in a moment.
Meanwhile, you entered receipts into your bank account in two deposits of 1500. So you have a balance due on both sales invoices of 224.63.
Just what do you think is wrong? As @Brucanna already told you, the tax is calculated only once, upon creation of the sales invoice. The customer should have paid you for the full amount, including tax. And that total is what should be entered. You should not be checking any tax code on the incoming receipt, just entering the amount the customer paid.
Now, back to the tax amount discrepancy. How did you enter the tax? If you have a GST + QST tax code that totals 14.974%, I suspect you did something irregular to enter the tax. Because Manager calculates that tax to be less than you show. Can you post a screen shot of the input screen for one of those sales invoices? (Obscure any proprietary information). Then post the resulting sales invoice itself from View.