Psychic Armor not stacking?

[heartrisen]

on Psychic Armor description: "Increases defense by 1 and grants minimum defense equal to your level."

Whenever I tried to equip anything that has defense, it won't stacking them but displaying the same amount of it.
Can you help? (I'm half sure this isn't a bug, but I can't go post thread on another sub forum.)

 

[Fenoxo]

If your defense from items is lower than your level, it grants your level as defense, otherwise it adds +1 to the total.

        if (this.hasPerk("Psychic Armor"))
        {
            if (temp < this.level) temp = this.level;
            //If defense is over minimum, add 1 :3
            else temp++;
        }