@Kkoerlin The difference is $1,400. Did you enter the amount you got for the 3rd Stimulus payment? You tried to claim it again on 1040 line 30 for the Recovery Rebate Credit. Line 30 is only if you didn't get the full amount or qualify for more.
Double check your bank statements and check your IRS account to see what they sent you. Check both IRS accounts if married.
Your Online Account | Internal Revenue Service
If the IRS says they sent it to you but you didn't get it then Request a trace for a missing third Stimulus payment
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...Your Online Account | Internal Revenue Service
