it seems you went into the original file and made changes. you will have to undo those changes to get back to the original. with the desktop version you should be able to review the return to make sure it's back to the original. if unsure you should be able to go online to the IRS website and download/view a transcript of the original (tax return transcript). once done save the file and close Turbotax. Restart Turbotax and look for the gray or blue amend icon and click on that. Then make your changes.
https://www.irs.gov/individuals/get-transcript
