Hi CharleneGSC!
It's great that you know how to exclude duplicate transactions. QuickBooks Online is dependent on what the bank provided to us. I suggest reaching out to your bank to see if they have an issue regarding this and how to stop it.
Also, I noticed that you posted this concern twice. One of my colleagues shared additional info to fix this. Please check this link and perform the troubleshooting steps: https://quickbooks.intuit.com/learn-support/en-us/banking/how-do-i-delete-bank-transactions-that-wer....
I've added some links you can browse. These will show you how to handle bank transactions and balance your accounts:
Keep on posting here if you need anything else. Have a great one!
