It could be that the box was checked earlier in the process. You could try deleting the worksheet that contains this information. Go to Forms Mode and look for a Schedule B, Seller-Financed Mortgage Interest Statement. If it is there and has no needed entries, click Delete Form at the bottom and this may resolve the issue.
Checking your Forms or checking My Tax Data under Tools can help you identify where an unexpected entry was made in TurboTax Desktop products.
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