Use the "Delete a Form" tool to
remove the Form W-2 and the Schedule C created when the "statutory employee" box got checked.
See: How do I delete forms in TurboTax Online?
After deleting the Form W-2 and the Schedule C , log out of the
program. When you log back in, use the Delete a Form tool to confirm
these forms have been removed from the list of forms in your
return. Then, reenter the Form W-2 without checking the "statutory employee" box
Why does this happen? Once you enter (or import
or transfer) certain information, the program creates or updates forms and
worksheets that use that information. In many cases, you cannot
"change" that information in the interview process - in a manner of
speaking, it has been "written in ink" on the forms. You have to
delete the form and any associated worksheets in order to correct.