I bought a Demi Lich source from the AH "Ransacking Demi Lich"

It has:

+107-374 Damage
+14% Magic Find


But I was looking at the hero planner on diablonut to see what the potential range of damage for a source is... and for Demi lich (the highest level one) all I see is (1-295) Maximum damage, and (28-110) Minimum Damage.

The max damage for this one I bought far exceeds the amount quoted on diablonut, any explanation for this discrepancy?