Retirement tax questions

Thank you again for the answer.

 

Now there is a new twist - I made a $3,500 non-deductible contribution to traditional IRA in 2020 for tax year 2019, so I went to update it in Turbotax. From what I can see, this shouldn't change any of the calculations below (at least when I manually complete form 8606, I get the same $7,429). However, TurboTax now calculated the taxable amount to be $7,264. Any idea how they got to this number? This is driving me crazy...