Creeping Frost piercing while wearing Snakepit

Tbh, I'm not sure if I'm just seeing things, but it should be easily enough to check.

I play creeping frost last league and never notice this behavior. I started noticing that the projectile will pierce the monster closest to me and explode at the target location. Today I been paying particular attention to this and saw it on several occasions. Now, it could just be that the projectile pass next to the monster and never actually hit it, but some of these monsters are quite big like porcupines.

Links are CF, GMP, Swift A., Cont. D., Ele. Focus, and Effi.

Snakepit in left ring slot.

Tooltip does say projectiles cannot pierce and projectiles fork.

edit: misread the post.