Don't understand what happened on your 2020 return for the first 2 Stimulus payments. You only had to enter what you actually received and Turbo Tax would claim any missing amount on line 30. Sounds like you claimed too much on line 30. Maybe you missed entering the total you had already got. Like you might have got the second payment for 2020 after you filed. It came out Dec 2020 - Feb 2021.
