2021 is a completely separate program from 2020, so one shouldnt affect the other.....you didnt use the 2021 program to EF the 2020, did you? Each year is separate, a 2020 return would have been filed using the 2020 program.

If you used the 2021 program and EF a 2020 return, you need to amend that to the correct 2021 information.