How to deal with 2 Backdoor IRA conversions in one calendar year - 2 tax years

In Feb 2021 I made a 6000 contribution to a Trad IRA and then do a conversion to a Roth IRA. I had not made any contributions in 2020, so I reported this on my 2020 Taxes. I reported the distribution just based on my statement my my financial company, and then reported the rollover.

 

However, throughout the rest of 2021 I contributed an ADDITIONAL 6000 to the Trad IRA, and then on Dec 31 converted to the Roth IRA again.  I am trying to file my 2021 taxes.  The 1099-R form I have shows the full 12000 as the distributions. Given that i've already reported 6000 dollars of this total 12000 in distributions on my 2020 taxes, show I just enter a modified amount in the 1099-R field in turbotax?  Or did i screw up my 2020 return and i need to amend it?