After more testing with different builds, AoE , melee, range, all classes, i singled out the suspect of the Enrage token bug.
The items with the enchant +1 Enrage token on critical hit, doesnt stack on single target and AoE skills, they only stack on channeled skills.
Because the Enrage token disappears at the same attack which gave the token, so it can never stack.
For example i do 1 crit with a single target or AoE attack, i dont get 1 token, i get 0 because after the attack animation i see the Enrage token pop up, and then disappear in a split second.
I did futher testing with get enrage token on kill, and it seems to stack correctly, so its only the enrage token on crit that is the problem, as far as i can see.