Sorcerer build question

Maybe dumb question, but cant figure it out. I have a mage on ps4 that I have 5 pieces of mother sorrow on. No problem there everything seems to be stacking fine. But I have a D staff that is gold lvl Law of Julianos and a waist is purple Law of Julianos that doesnt stack. Thought that gear lvl did not stop it from stacking, only reduced the stat. Weirder yet is I have 2 pieces of endurance both purple and it is giving me credit for 3. Anyone able to help me figure this out? Thank you in advance