Turbotax incorrectly showing an excess roth contribution

To boil it down, I'm worried I'm going to be double-taxed.

 

My 1099-R shows $12,000 in taxable amount for 2022. (But it also checked off Box 2b - taxable amount not determined.)

 

What I did in 2022:

- Contributed $12,000 to my IRA before the Apr 2022 tax deadline - $6K for 2021 and $6K for 2022. (I forgot to contribute in the 2021 calendar year, but it's allowable until the '22 tax deadline.)

- Immediately did a roth conversion on the $12K (aka. back door)

- The $6k for 2021 WAS reported in my 2021 taxes.

 

Now, doing 2022, I'm entering a $6K contribution, with a $12K basis (based on my research)... but Turbotax is saying I have a $6K excess contribution. What am I doing wrong??!