After you file


@Greg Nauman wrote:

This is for the 2021 March 17 payment. 

On my 2020 tax return it is marked 1 daughter as a dependent and my older daughter who is 23 is marked as no longer a dependent. 
So should be Me, My wife, and our disabled daughter. 
We received a 5600 payment and that is what the IRS website shows. 

so no idea why we received that much 


WHOA!   Now you say you have 2 daughters?  How old?  How is the 23 marked for no longer a dependent?  If she is listed on the return you get the 500 other dependent credit and will get the 3rd 1,400 for her too.   So you did have 4 people listed on your 2020 return (1400x4=5600).