If I make a subgrade adjustment it shows in the cross section and 3d view correctly, as 'FD adjusted' 12 inches below 'Finish Design'.
However, if I run a Earthwork Report with 'Finish Design' as the initial surface and 'FD with subgrade adjusted' as the final surface it calculates as fill. Also, if I create a Cut / Fill Map with the same surfaces, it shows a fill of 12 inches.
I have even tried switching the initial and final surfaces, but i get the same results, cut / fill map shows fill, and report shows fill.
It seen like something is telling it that the 'FD with Subgrade Adjusted' is above the 'Finish Design'