I had the same problem. You are on the right track by deleting forms but deleting the 1040 wks form did not work for me either. I found what caused the issue is if you delete something in the self employed section of income, 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. I just deleted all of the 1099NEC and all of the section C and went back and started a new 1099NEC. Worked fine after that.
