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I'm here to ensure your Tennessee sales tax information is correct in the program.
QuickBooks Online automatically calculates the total tax rate for each sale based on these factors:
With that said, I suggest reviewing your customer's information and make changes if necessary.
Whenever you create a sales transaction, you can view the total sales tax and how it's calculated. You can click the See the math link for details.
You can take to this screenshot as an example:
As for the duplicate entries you mentioned, I suggest deleting them to maintain accuracy in your books.
If you need to reconfigure your setup on where you collect sales tax, check out this article: Set up where you collect sales tax in QuickBooks Online. This includes the steps on how you can add a new tax agency in your QBO company.
Do you have other questions in mind? Place them in the comments below, and I'll get back to you.