I entered 2020 data in TurboTax but didn't file. It looks like some inaccurate data got carried over to 2021 while some data is missing and would like to know what I should do.

I entered 2020 data in TurboTax but in the end went with a CPA and didn't file using TurboTax. 

I'll be filing with TurboTax for 2021. It looks like some inaccurate data got carried over to 2020 while some data is missing and would like to know what to do in order make sure it's not going to mess up my 2021 taxes. For example I'm not sure how this happened, but there was a 1099-misc there from a rental property I sold in 2020 that shouldn't have been there. I wonder if it was trying to carry over some data from stuff I entered in 2020.

Also I had an negative adjusted gross income for 2020. When I started filling in data for 2021, I think TurboTax had asked me to fill in what my Adjusted Gross Income was from last year. How does that affect my 2021 returns?