It sound like you failed to enter your 2019 non-deductible contribution so it is not on the 8606 line 1 to be added to the 2018 carry over in line 2 so the total is on line 3. If your 2018 line 14 was $5,500 and a $6,000 2019 contribution the line 3 should be $11,500.
Enter IRA contributions here:
Federal Taxes,
Deductions & Credits,
I’ll choose what I work on (if that screen comes up),
Retirement & Investments,
Traditional & Roth IRA contribution.
OR Use the "Tools" menu (if online version under My Account) and then "Search Topics" for "ira contributions" which will take you to the same place.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
