Did you file a 2020 tax return that had unemployment BEFORE the tax law changed? Or was your stimulus payment based on 2018 or 2019 instead of a lower 2020 income? You may have just received the "extra" refund for unemployment you paid tax on, or a "plus up" stimulus payment.
https://www.irs.gov/newsroom/irs-begins-correcting-tax-returns-for-unemployment-compensation-income-...
https://www.irs.gov/newsroom/irs-treasury-disburse-more-economic-impact-payments-under-the-american-...
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