After you file

It looks like my income was entered twice, once in my federal and again in state 2017 return. I used the free site last year and have been told by IRS that I owe $1600.00. I went on the IRS website to confirm same and it said that I didn't owe anything. I think it's because we filed married jointly last year. I then received another letter stating the amount owed. Do I need to file the 2017 amendment before I file my 2018 taxes? Can this be done by using the free Turbo Tax site?