Retirement tax questions

Thank you. I did follow those steps. I actually went back and looked at my previous years contribution and added them all up, which ended up as $47000. I entered that as the basis, at the end it showed me only $519 out of $2310 was non-taxable. I don't understand. I already paid taxes on the $2310. Now that I converted it to Roth, I have to pay taxes on $1791 of them. Shouldn't all $2310 be non-taxable because I already paid taxes on it and was not able to deduct any of it?