You can exclude those double-counted transactions directly from your bank feeds. When you reconnect a bank account, QuickBooks scans for data and can download older, overlapping transactions that you have already verified.
To resolve this, check where the duplicate sales currently appear. If they are still pending, go to Accounting > Bank Transactions > Pending/For Review, tick the boxes next to the duplicate entries, and select Exclude at the top of the list. If they have already been added to your books, navigate to the Posted/Categorized tab, locate the duplicate entry, and select Undo. This moves it back to the For Review/Pending tab, allowing you to exclude it.
However, if these transactions have already been reconciled, you'll need to unreconcile them first to keep your account balances accurate. Once cleared, you can return to the bank feed to undo and exclude the entry.
Feel free to return if you have any follow-up questions.