I believe there is a bug with taliyah where her Q does 100% damage on all 5 rocks

I was in a game as viktor vs taliyah where 6 (she cast her Q twice but I died on the 6th one) of her Q rocks killed me for a damage of ~2277.

She had 1030 AP so her Q should do max damage 140+40%AP for the first rock and 70+20% AP for the next 4 resulting in 420+120% AP. Since another rock hit me add another 140+40% AP. So the total damage is 560+160% AP. With 1030 AP this results in 2208 damage for all 6 rocks. I had 42 MR which reduces damage by ~30%. Which means I should be dealt 2208x70% = 1546 damage. I took ~2277.

Now if her Q isn't 50% damage i should take 140x6+40%x6 = 840+240% AP damage x70%. With 1030 AP I should take 3312x0,7 = 2318 damage. This is much more like the scenario that happened.

TL;DR I believe taliyah's Q does full damage for all 5 cast instead of only the first one and next 4 having 50% damage.