It has nothing to do with your Internet browser or your Internet connection or anything else the other guy said. It is TurboTax. 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. 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. The forms giving you the problem may be different but just go through your forms and look for duplicates, delete all forms that you see a duplicate of (including the original form) and restart that section.
