I could be wrong here as I don't use the energy evaluation side of things at all.
But are you comparing reports from the built-in energy evaluation that comes with Archicad (I know it as EcoDesigner) with the full product that you have to purchase a license for - EcoDesigner Star?
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10