Ok, let me explain before you guys start to spam me, or scold me
neither laugh at me

Currently, my Nova is 29,

i understand that the Maximum i can add is 30

then with Weapon + skills can add up to at least 40


i tried to remove all my weapons and charm, and it becomes 20, so
i try to add, it cannot be added


well, i tested out on my Lightning Mastery, i can add points from
22 to 30,

The problem here is how come i can add Lightning Mastery to 30 and
Nova can't add anymore

Please guide here