There were likely programming updates in the meantime. The refund number is not accurate until you have completely finished.
I suspect what you saw earlier were "Tax Breaks" of a Personal Exemption ($4,050) plus the Standard Deduction ($6,350 for Single) = $10,400. Those are subtractions from income before the taxes are calculated, not tax credits or a refund.
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
