I had the same problem. I found what caused the issue is if you delete something, turbo tax is not deleting the form associated with it like it is supposed to and it is creating a duplicate form when you enter the correct information. I had duplicate 1099NEC and section c forms but only showing one 1099NEC on the walkthrough. I just deleted all of the 1099NEC and all of the section C forms and went back and started a new 1099NEC. Worked fine after that. It may be a different form on yours but go through the forms and look for duplicates to delete.
