Retirement tax questions

I followed step-by-step. but still have problems:

 

In 2021 I made a 2020 and 2021 after tax contribution to a new traditional IRA and proceeded to convert the total amount to a new Roth IRA. My 1099-R lists a distribution for the total amount of $12,000 and 12,000 in box 1 and box 2a (2020 and 2021 contributions).  Line 4b in 1040 shows 0 now, which is correct. however, Turbo tax indicates I owe 6% penalty of exccess contribution to IRA ($6000 each year) after I followed the "back-door Roth IRA" 2-step process in Turbo Tax.  

what shall I do?