SpellVamp doesnt function properly

SpellVamp doesnt seem to function correctly on enchanced/increased abilitys! http://imgur.com/0ec3dEJ http://imgur.com/7woVbEV

Would be nice if this could get fixed, spellvamp is rather weak/only in low amounts obtainable, so this is in the way of my rather fun ryze build ;P Or if i could get noted, if this is intended behavior or not? Thx

I even have an idea why this is not working: Since the enhanced Dmg is reducable by Randuins AntiCrit mechanic, i assume the extra dmg is viewed as an AA crit, thus not working with spellvamp. But this is just an idea where the bug could be :D happy hunting