Problem with my spellbook.

[Jougi]

I am making a spellbook that has 4 levels and includes 4 spells, Z, X, C and V. I want to work like this.

1. level includes: Z-lvl1
2. level includes: Z-lvl2 and X-lvl1
3. level includes: Z-lvl3, X-lvl2 and C-lvl1
4. level includes: Z-lvl4, X-lvl3, C-lvl2 and V-lvl1

I've been using this kinda trigger

myspellbook trigger
    Events
        Unit - A unit Learns a skill
    Conditions
        (Learned Hero Skill) Equal myspellbook
        Or - Any (Conditions) are true
            Conditions
                (Unit-type of (Triggering unit)) Equal to Guy1
                (Unit-type of (Triggering unit)) Equal to Guy2
    Actions
        Unit - Set level of Z  for (Triggering unit) to (Level of myspellbook  for (Triggering unit))
        Unit - Set level of X  for (Triggering unit) to ((Level of myspellbook  for (Triggering unit)) - 1)
        Unit - Set level of C  for (Triggering unit) to ((Level of myspellbook  for (Triggering unit)) - 2)

I don't need to trigger V, because it only has 1 level.

But i'm running to this problem every time i play with my character. When i learn a new level of that spellbook, it doesn't have the spells inside the spellbook. It levels up the spells to the right level, but some of the spells aren't there. I just cant figure out what is wrong with my book. If you have a suggestion what to do, please tell me.

EDIT: Fixed the problem, my maximum and minimum spells values were wrong.