Let me help and share with you some information about the Automated Sales Tax in QuickBooks Online.
The Automated Sales Tax calculates based on the Location of the sales occurred. It automatically calculates tax for the shipping fee of the customer.
To delete the sales tax payment, you can delete the adjustment you made.
I'd also suggest reaching out to our QuickBooks Online Support to help you confirm what agency (State) is showing that needs to be paid and to verify the payment amount in the bank.
The following articles are good references:
Should you have other questions about Automated Sales Tax in QuickBooks Online, don't hesitate to drop a reply below.