You should have received $2,400 for the two of you for the first stimulus and $1,000 for the kids, assuming they were under ager 17. You should have received $2,400 for the second one for all of you. So, if you received $1,800, the difference would be $4,000.
The IRS goes off of what is on your tax return for 2020 to figure your stimulus benefit, not what was on your 2019 tax return, that was just used to estimate what you would enter in 2020. So, the stimulus payment you have due you seems accurate.
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