So this could not be a bug but based on my knowledge of the game, I'm pretty sure it is. I walked over a single Jhin trap and it did 1156 damage and he had 0 ap. I know AP scales even without building magic damage but I do not believe it should be able to do 1156 damage.
ACTIVE: Jhin places a Lotus Trap at the target location that lasts for 2 minutes. The Lotus Trap blooms if an enemy walks over it, Sight icon revealing all enemies caught inside for 4 seconds. Blooming Lotus Traps Slow icon slow all enemies inside for 35% for 2 seconds before detonating, dealing magic damage to all enemies caught in the explosion. Lotus Traps deal 65% damage against non-champions and champions recently hit by one. 「 MAGIC DAMAGE: 20 / 80 / 140 / 200 / 260 (+ 120% AD) (+ 100% AP) 」
