If the only Roth conversion you made was a $7,000 conversion in 2021, no conversions before that, what you describe sounds right as long as there were no gains in the traditional IRA (possibly losses). In 2021 you would have added a $7,000 nondeductible contribution and used $7,000 of the basis, resulting in no net change to the basis carried over to 2022. If this description does not agree with what actually was done, you've probably made one or more Form 8606 errors somewhere between 2019 and 2021.
