After you file

@Rgrosh   Did you get the 3rd Stimulus payment during the year?  It was 1400 per person. Check your bank statements.  And you should have gotten IRS letter 6475 saying what they sent you.   Did you have 1400 on 1040 line 30?   You tried to get credit for it again, but the IRS already sent it to you so they took it off your return.  There is no more refund to get and nothing to fix.