Kog'Maw Passive Sound Bug

Played an Aram a little bit ago and something very annoying/disconcerting kept happening. Every time Kog'Maw came into vision from the side of my screen, the sound from his passive would begin and it'd make me think I was about to take a bunch of dmg. The mixed signals threw me off big time, plus it's a bit annoying to hear that sound over and over again.

Video is linked above