It sounds like on your 2019 Federal tax return, your claimed married filing jointly and received, as an example,
1st stimulus $1,200 + $1,200 = $2,400
2nd stimulus $600 + $600 = $1,200.
On your 2020 Federal tax returns, you are each claiming married filing separately.
You should each claim the $1,200 and $600 for stimulus payment 1 and 2, respectively.
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