Can I be refunded payment to TurboTax if my refund amount they estimated was incorrect by $1600?

TurboTax estimated I would receive about $1600 for my California state refund. This amount was accepted by the IRS on 1/29/25. However, I never received the refund. Today I received a "Notice of Tax Return Change- Revised Balance" form explaining that I now owe $13. Why is there such a discrepancy? I trusted TurboTax's estimate when budgeting and now I'm not getting $1600 I expected. I would like a refund.