Get your taxes done using TurboTax

Somehow the schedule C is being linked to a W-2. It might be some work, but if you could delete the business and re-create it that would probably solve the problem.

Also, you could try entering a dummy W-2, and click on the "Statutory Employee" box. Later, you will be asked if you want to link the W-2 to a schedule C, to which you would answer "no" and then a new schedule C will be created and be linked to the dummy W-2. That might result in the original schedule C being unlinked.