After importing transactions with Transaction Pro Importer for QuickBooks Desktop (QBDT), the address box is showing duplicated address lines in QBDT.
Select CLEAR TRANSACTION BILL TO/SHIP TO ADDRESS WHEN IMPORTING on the BASIC tab under OPTIONS on the first window of Importer. Selecting this option clears all transaction address information before creating the transaction. By default, Importer fills in the Customer Bill To and Ship To information when creating the transaction from the defaults set up in the Customer account in QBDT. While this works well when only specifying the Customer on a sales transaction such as Estimate, Invoice, Sales Order, or Sales Receipt, it can cause duplicate address lines under certain conditions. Selecting this option assures that the address lines on the transaction match those actually being imported.