3rd Stimulus Payment

We received the 3rd stimulus payment for my son, because we claimed him on our 2019 taxes.  When he filed his own taxes for the first time in 2020, he received the 3rd stimulus payment.  When I enter the amount that I received from Letter 6475, which includes my son's $1,400, it deducts the money from my refund.  It also says that I shouldn't have received the full $2,800.00 for my husband and me?  There would be no reason that we would not have each received our $1,400.00, as we are under the AGI threshold in both 2019 and 2020?  I have seen many discussions stating that we do not have to return the stimulus payment that we received for our son, but Turbo Tax deducts the money when I enter the amount from my Letter 6475?