Did you enter any unemployment? There was a change for that. You may have filed before it happened. Turbo Tax has been updated and will show you the new refund. For Online, you can log back into your return and it should automatically update your return and show you the new refund. But the updated return won't be sent. The IRS will adjust it for you.
You can exclude up to 10,200 of unemployment unless your income is over 150,000. The IRS will recalculate your return for the new unemployment exemption if you already filed.
If you have filed, the IRS will recalculate your return for the new unemployment exemption for you. There is no need for taxpayers to file an amended return unless the calculations make the taxpayer newly eligible for additional federal credits and deductions not already included on the original tax return.
See this new IRS May 14, 2021
https://www.irs.gov/newsroom/irs-begins-correcting-tax-returns-for-unemployment-compensation-income-...
