It seems you had a distribution/conversion in 2019 and left a value in the traditional IRA and therefore, the $2,964 basis were allocated to the amount left in the IRA. The $8,536 basis was allocated to the distribution/conversion in 2019.
Did you make another nondeductible contribution in 2020 or are the $9,000 what was left in the traditional IRA from prior years? If it was the left over amount then it seems you had gains of $6,036 and any gains would be taxable.
To avoid having to pay tax on conversion you should make the nondeductible contribution and then covert the amount right away to avoid having gains in the traditional IRA.
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