This may be what I call a "ghost" form hanging around from your 2020 return. Essentially, it's a form that transferred over (as a convenience to the user), and it's waiting for you to fill it in.
You may be able to identify the form by using the info I'm linking below.
How do I view and delete forms in TurboTax Online?
If the first solution doesn't work, scroll on down to the other "Tip", and use the suggestion at the second bullet point. You'll be looking for the vacant form, and then should be able to delete it.
*** 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.***
