From the amounts you received, it looks like the first stimulus was for 2 Taxpayers and 7 children [$2400+ ($500x7)]. The second looks like it was for 2 taxpayers and 7 children as well, ($600x9).
The payments were an advance credit for 2020. 2019 information was used in sending out the payments since 2020 tax returns had not been filed at the point the stimulus payments were sent out. They are being reconciled when you do your 2020 return. In some cases, people may have been given a stimulus payment based on their 2019 dependents that did not qualify based on their 2020 dependents, and vice versa.
How many dependents under age 17 did you have on your 2020 return? If on your 2020 return you had 9 dependents, but only 7 were under 17 then you received the correct amount.
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