Based on what you've said, you do not have any Nondeductible Contributions. You had $3420 for 2021 and $6,000 for 2022, both fall within the contribution limits. As a result, you reduced your income, or basically got a tax deduction for those contributions. So, when you convert it to a ROTH the IRS wants the tax that you didn't pay earlier, and in this case the entire distribution is taxable.
Based on what you've shared with us, you did not have "Any Nondeductible Contributions to IRA?"; therefore, that entry should be zero.
To address your final question. The full amount of your transition from a Traditional IRA to a ROTH is taxable. You will have taxes assessed on the ROTH contribution because of the issue stated above. However, the ROTH contribution and any growth will not be taxed again.
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