Major and Minor Brutality giving same buff amount.

Ringod123

I have a Stam DK who with their current setup has almost exactly 3k weapon damage. Now casting Igneous Weapon should give me Major brutality for 54 seconds and minor brutality for 20 seconds, meaning for the first 20 seconds I should have 30% more weapon damage which then drops to 20% after 20 seconds. However, when first cast I go from 3k to 3.6k (20% increase total) and when Minor brutality falls off that goes down to 3.3k. How can both minor and major brutality only be giving me a 10% increase in weapon damage? When first cast I should be getting 600 extra from Major and 300 extra from Minor, but both major and minor are only giving 300. Now I could understand if there some other class/skill buff that was making up the original 3k which does not get affected by major/minor brutality, but the numbers clearly show both minor and major giving me 300 weapon damage. How? Why? Surely this is not correct?