If the Roth conversions were made in 2023 and making here traditional IRA contribution lowers your tax liability, it seems to imply that your spouse has other money in traditional IRAs that affect the pro rata calculation of the nontaxable amount of here Roth conversion.
(Note that if your AGI is low enough that your spouse's entire traditional IRA contribution is eligible to be deducted, you both could have made contributions directly to the Roth IRAs, but that not an option after having contributed to the traditional IRAs and converted.)
