Sorry but your refund was only for the Recovery Rebate Credit (3rd Stimulus payment). If you had answered right and said you already got the 1400 then you would not have a refund but a $3 tax due. You have no refund. The IRS is right and there is nothing you can do or fix.
Ignoring the 1400 on line 30 you need to compare 2021 to 2020 all lines and see what changed. Did you make less in 2021 and have less withholding taken out? Are you missing a dependent on your 2021 return?
