enemy crit extra damage reduction

in the defence tab you have :
enemy crit extra damage reduction %

when you use a watcher's eye with the mod :
You take (60-40)% reduced Extra Damage from Critical Strikes while affected by Determination

when i turn my determination aura ON

it doesn't change the "enemy crit extra damage reduction"
in the defence tab

is it taken into consideration within the final damage calculation ?

thanks if someone actually know this kind of stuff ^^

It should be taken into account, but I don't know how it's calculated. It's possible that the Watcher's Eye mod is only taken into account when you are actually crit.

Are you sure you didn't have another Determination turned on?

If you didn't, I would contact support / submit a bug report.