Maokai or Mordekaiser BUG

I played a match with Mordekaiser in top lane, i was against Maokai.

My creep wave pushed under the tower and I went in to attack the tower few times. Maokai used his Twisted Advance (W) and Arcane Smash (Q) on me, and the tower suddenly targeted me. I ran out of the tower range, healed and came back to the lane. Same thing, went to attack tower few times, he uses twisted advance and arcane smash and the tower targets me. I didnt use my Creeping Death (W) and I had no gromp buffs, masteries or ANYTHING that would reflect damage to Maokai, yet the tower started attacking me, when there were creeps right next to the tower.

I tested the bug on custom game and got it to work a few times, but not always.