Received 21K from a pension. Put in a Traditional IRA. Converted 12K to a Roth IRA. Why do both transactions show as Total Income of 33K, when the 12K came from the 21K?

The 21,000 came from an employer sponsored pension plan.

I converted the 12,000 within 60 days of receiving the 21,000 and all transactions happened in 2017.

I received 1099-R for both transactions and realize that the 21,000 will not be taxable and the 12,000 will be taxable.