Understand Difference between B09005 and S0901

I am trying to understand why some of the numbers in B09005 do not match the values in S0901. I am just looking at the "Children under 18 years in households", the Estimates for "Total" and "In married-couple family household" match fine, but the other two: "In male householder, no spouse present, family household" and "In female householder, no spouse present, family household" are off by a good number." Any help would be greatly appreciated. Looking at 2019 ACS-5 for Nation