It sounds like you have some 1099Rs the transferred from 2019 with no amounts in them. Go back to the 1099R summary page and delete any 1099Rs that are not 2020 1099Rs. After you have logged in and are in your return in TurboTax Online:
If that is not the case, go back and review your 1099R input screens to insure all boxes are filled with the information from your hard copy 1099Rs.
The 1099 Series are informational reporting forms submitted to the IRS by third parties. The IRS then matches the form information to your tax return to insure all income is reported and taxed.