Passive Tree's "Increased Armour" nodes

I'm assuming that the "30% increased armor," "10% increased armor," and etc. nodes increases your armor for obvious reasons.

However, I checked in my character panel and after completing an entire node, I should be getting 50% increased armor but did not notice my actual armor value increasing at all.

Is this because the character panel did not update itself? I tend to find that the character panel updates instantly for everything else.

Am I interpreting these armor nodes incorrectly? I'm not quite clear on if the armor percentage is additive or multiplicative(I'm assuming multiplicative), but at LEAST I should be seeing an increase in my armor value overall.

If i remember correctly, my armour increase was instant in the moment i've selected armor nodes, maybe it's only a bug. :)

Have u tried to reboot your game?