There were 2 Stimulus payments in 2020. Did you get the first one which was $1,200 for each spouse, so 2,400? Then the second Stimulus payment is 600 per person. So the total for 2020 for married Joint is 3,600.
The second Stimulus payment would have come between Dec 2020 and Feb 2021. So if you got it in 2021 it was for 2020.
