(BUG) Veigar´s Q damage is lower than is written. (My MR penetration?)

My damage with 2% mr penetration = 300, but i do to minions -2% less (i guess). = 296. And its increasing. I have written 800 damage with void stuff and damage to minion would be 760. the mr penetration on veigar´s q is decreasing damage.
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