Hi there, @njdarling87.
You can match the downloaded transactions with the one you already entered. This links the two to avoid duplicates.
To know more about matching transactions in QuickBooks, click this article: Add and match downloaded bank transactions [Video].
I'm also linking an article that will help you in the future: Reconcile a bank account and common troubleshooting tips [Video].
Let me know if you have any follow-ups or other questions. I'm here to help. Take care.