@Jennifer1974 , I had the same problem (incorrect numbers for itemized deductions in column A of Form 1040-X). The TurboTax support line was helpful--in terms of validating that this was in fact a software bug. I FOUND A WORKAROUND, as follows:
After "Save As" and "amend", Form 1040-X in TurboTax does not allow me to select "Override" for the incorrect entry in Column A, but it allows me to paste in the correct number from the original 1040. I had to do this in 3 places: line 2 col. A, line 6 col. A, and "Original 2019 Return Payments Smart Worksheet" col. B. The program then adjusted columns B & C to be the correct values (as I calculated by hand), and correctly produced the remaining forms for the amended filing (federal and state).
