Quickbooks online deposit creates duplicates - Need to exclude-WHY??

Welcome to the Community, @Margery1.

Allow me to provide some details about the Match, Add, and Transfer button on the Banking page.

The Match button is used when QuickBooks matched the transactions that you've created and those that are downloaded from the bank. This helps avoid any duplicates. 

The Transfer button is for transferring transactions to a different bank account. You'll have to select the appropriate bank account from the drop-down menu and then click Confirm.

While the Add button means adding your bank transactions to QuickBooks and this will go to your bank register.

Excluding transactions is done if you've made another deposit within the same account. To avoid duplicates, the best way to add the transactions is to transfer them from one account to another and then match them. I'll guide you how:

1. From the Transactions menu, select Banking.
2. Ensure that you have selected the bank account to transfer from.
3. Locate and select the transaction to open it.
4. Select the Record transfer radio button and select the other account from the Transfer account drop-down list.
5. Select Confirm.
6. Once done, select the bank account to which you transferred the transaction.
7. Select the Recognize tab and locate the transaction. The Category/Match column should indicate a match was found.
8. From the Action column, select Match.

I've included an article that'll guide you in reconciling your accounts. This helps you ensure your accounts in QuickBooks match your real-life bank and credit card statements:  Reconcile workflow in QuickBooks.

Stay in touch with us if you have other banking concerns. We're always here to help.

I don't know if this has anything to do with your experience, but sometimes QBO app on my phone goes into glitch mode and duplicates things, such as receipts. It seems that the all-purpose fix for most things in QBO is to clear the app cache, clear the data, or delete and re-add the app.