Hello @Tree Valley,
There are several causes on why your transactions are being duplicated. Let me share them with you and guide you how to resolve this.
Let's review and verify those duplicates, and then exclude or delete them. I suggest getting a hard copy of your bank statement and comparing it to your bank report in QuickBooks.
Once you have your printed bank statement ready, please follow these steps:
Also, here are some articles you might want to read for future reference:
If you have any other questions, please don't hesitate to drop your comment below or post again here in the Community. We're always around to help.