Some things in the question need clarification:
You mentioned "our traditional IRA." I'm guessing that you meant to say "our traditional IRAs" since IRAs are individual IRAs not joint IRAs and because you each received Forms 1099-R, implying that you each had IRA accounts.
You mentioned a backdoor Roth, so I assume that the money that went into the traditional IRAs were a regular nondeductible contributions.
Nothing about these transactions is to be entered as a Roth contribution under Deductions & Credits. These were not regular Roth IRA contributions. Go back and correct the entries you made under Deductions & Credits.
I'm guessing that the reason that you each received two Forms 1099-R is because you are both under age 59½ and the amount that went to pay state tax withholding had to be reported on a code-1 Forms 1099-R separate from a code-2 Forms 1099-R reporting the amounts converted.
Nothing has changed in TurboTax with regard to handling these transactions. When entering the Form 1099s-R that report the Roth conversions, indicate that you moved the money to another retirement account, that you did a combination of rolling over, converting and cashing out, then enter the entire amount in the box for Roth conversion. For the Forms 1099-R that report tax withholding, if you did not substitute other funds to convert this distribution to Roth, indicate that you cashed it out. (It was likely a mistake not to tell the traditional IRA custodian not to withhold the default 4.25% MI tax withholding on the conversion.)
