By the way, I do get results like these when doing various MvP damage tests in 1.10 final. MDR/DR in large enough amounts ends up reducing too much damage from multi-element hits. Just a few examples of tests I've done:
I set up a monster to do 50 physical and 50 lightning damage. A standard control hit results in 100 total damage.
Tossing in 60 MDR actually results in a total damage of 40 (when it should be 50). Adding 40 more MDR results in 0 damage taken. The same applies with DR. With 60 DR, total damage is 40 and with 100, total damage is 0.
In another test I set up a monster to do 50 physical, 50 lightning, and 50 fire damage.
-With 60 MDR, the total damage comes out to be 30 (while it should be 50).
-With 60 MDR and 50 physical resistance, the total damage comes out to be 5 (when again it should be 50).
-With 90 MDR, the total damage becomes 0.
-With 60 DR, the total damage becomes 90.
-With 60 DR and 50 phys resist, the total damage is still 90.
-With 120 DR, the total damage becomes 30.
-With 150 DR, the total damage becomes 0.
The theory so far is that when MDR/DR makes the amount of damage for a given type negative, that negative value doesn't get corrected to 0. When they're negative, resistance and absorb steps would get skipped over and that negative amount ends up reducing the total amount of damage done when all the final damage amounts for each type get summed together way at the end of the damage modification process.
I set up a monster to do 50 physical and 50 lightning damage. A standard control hit results in 100 total damage.
Tossing in 60 MDR actually results in a total damage of 40 (when it should be 50). Adding 40 more MDR results in 0 damage taken. The same applies with DR. With 60 DR, total damage is 40 and with 100, total damage is 0.
In another test I set up a monster to do 50 physical, 50 lightning, and 50 fire damage.
-With 60 MDR, the total damage comes out to be 30 (while it should be 50).
-With 60 MDR and 50 physical resistance, the total damage comes out to be 5 (when again it should be 50).
-With 90 MDR, the total damage becomes 0.
-With 60 DR, the total damage becomes 90.
-With 60 DR and 50 phys resist, the total damage is still 90.
-With 120 DR, the total damage becomes 30.
-With 150 DR, the total damage becomes 0.
The theory so far is that when MDR/DR makes the amount of damage for a given type negative, that negative value doesn't get corrected to 0. When they're negative, resistance and absorb steps would get skipped over and that negative amount ends up reducing the total amount of damage done when all the final damage amounts for each type get summed together way at the end of the damage modification process.