TurboTax is calculating the CO addback correctly in accordance with the CO addback worksheet. The CO addback worksheet line 2 amount is only the "Local income tax deduction included on Schedule A, line 5a". That amount is zero (0) in your scenario. That makes line 5 on the worksheet $3423 and line 8 on the worksheet $1957. The lower addback is $1957.
@KB_CO
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