So i was curious what causes the fact that my secondary bar has more max magicka than my front bar.. what i found out is that i have slotted Shooting Star at front bar and i have all passives learned, but the Magicka Controller passive doesnt give extra max magicka where the mage guild spell is slotted but to other bar, so in my case i have it in front bar and passive max magicka goes to secondary bar
Just use procs. Simple. No brain is required.