TFT Ionic Spark bug

I wanted to try out 3-4 Ionic Spark's for fun, and I noticed it does only 75 damage instead of 200. A friend said , maybe it's the magic resist that causes the reduction. In this case makes sense, but it makes the item beyond horrible. I'm better off not making it. What do you think? Edited: I built a draven with 3 statikk sivs and I noticed sometimes he does 180 damage sometimes 380... I don't get it.
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