Duplicate entries can be frustrating. I understand how important to resolve those duplicate expenses appearing on your credit cards and your expense report, Dave2023. Allow me to provide additional help.

If you haven't tried only excluding the duplicate transactions without deleting them, I recommend doing. It will stop the bank from bringing the duplicate one into the bank feed again. This is because the system will recognize that the transactions are already in your QuickBooks.

While deleting a transaction from the bank feed will download the same transaction again if you click the Update button. 

However, I want to go further by checking  my available resources. Can you share your bank's name? This helps me provide an accurate solution appropriate to your concern. 

Additionally, you can visit this article and use this as your guide to keep your bank data accurate: Categorize and match online bank transactions in QuickBooks Online.

You can go back here and post more if you have follow-up concerns about connecting accounts and handling transactions. I'll be around to help.