Hello, @Tami. I'm here to assist and provide some insights about this.
By default, the balance sheet report in QuickBooks Online depends on the imported data from the eBay Sales Channel, which includes the sales tax from your sales. Yes, I agree with manually excluding the imported sales transactions.
Next, I recommend checking your app transactions settings to prevent including sales tax collection from your sales and contacting eBay Sales Channel support.
I have left some articles to help you run a customized report and save your customization for future use:
You're always welcome here in the Community should you have any updates regarding sales tax payable in your balance sheet. Take care.