There should be no tax imposed on a non-deductible Traditional IRA contribution as long as you did not contribute more than the annual contribution limit.
Go back through the IRA contribution section of your return and be sure that you entered the contribution as a Traditional IRA contribution.
Also, double-check the amounts that you entered to be sure you did not include any earnings that may have accumulated between the time you contributed the money and the time that you converted it to a Roth IRA in 2023. If the account had accumulated earnings, then only the earnings portion will be taxable when you report the conversion on your 2023 return after receiving the Form 1099-R.
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