Damage Reduction While Healthy no registering properly

I am trying to work on 3 items to get to 100% damage reduction while healthy but the stats will not go over 74.9.
I also have a node on my paragon board. total with 3 items and board is 126%.
why will it not register 100% under stats area?

dmg reduction is inverse multiplicative. you cannot reach 100%. this is on purpose because then you would be invulnerable

what is the highest you can go go if the items are over 100%