How is Turbotax calculating the Income Taxes Paid line on the Your Tax Breaks screen (it shows a larger number than the total inc taxes withheld on the forms I entered)?

I have no W-2s, only a single 1099-R with a few hundred dollars of Federal taxes withheld. Turbo Tax says I've paid over $3,000. My est. tax payments are in a different line on the screen (even though the on-screen note says the Income Taxes Paid line includes them - it doesn't)