It looks like you were eligible for, but did not claim in our original 2020 return, an "Earned Income Credit" (EIC). All the other refunds in your transcript were for the recent stimulus payments or the non-taxability of unemployment compensation. (That unem comp provision was enacted after most people filed their federal return for that year - thus the federal refund after the filing.) So, check your original 2020 return to see that you did not claim the EIC in the original return. It simply looks like IRS audited your return, found that you were eligible for the EIC, calculated the amount, and sent you a refund. The EIC refund is not taxable in 2023 but any interest income received on the 2023 refund is taxable in 2023.
