Also, click on the blue balance, 107,806.72, for Inventory - sales in the Profit and Loss Statement and show the result. You have said the P&L is correct, but it obviously includes more than invoice 3083.
And try looking at the Inventory Value Movement and Inventory Quantity Movement reports for the day in question.
Also, are you using delivery notes? If so, what happens if you expand the date range on your reports to cover the date all units of MAXMM010 were delivered? And if you are using goods receipts, had all units you sold on invoice 3083 been received by the date in question?