Are you perhaps using an old TurboTax account that you and your wife used when filing jointly? If you're no longer married, you'll need to create your own new TurboTax account for filing as single.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***