Hello and welcome to the Community, teasechocolates.

It would be my pleasure to answer any questions you may have about the Sync With Square app.

When downloading bank feed transactions for your Square account, you'll need to choose the Match option instead of Add. You can Undo the bank transactions you accept from the For Review tab to fix duplicates.

Here's how:

1. On the left navigation bar, click Banking.
2. Go to the Banking tab.
3. Choose your bank.
4. Go to the In QuickBooks tab.
5. Put a checkmark on the box beside the transactions you want to undo.
6. Select Undo above the Date column.

I'm adding an article with additional information on this (scroll down to Wait, duplicate entries?): Sync with Square Hub

Please let me know if there's anything else I can do for you by leaving a comment below. The Community is on a look out for your response.