Zombie Noises in Background

I was doing an act 1 run with a friend to prep for league start and we noticed a rather bizarre zombie "grunting" noise in the background. It occurs every few seconds, so it gets annoying pretty quickly.

I tried turning off every sounds category and when everything is turned off except for the master volume it's still there, so that's the only thing you hear. The only way to get rid of it is to play without sounds.

I'm pretty sur there's a sound file that got misplaced in one of the latest patches (I haven't played poe for a month and a half).

Hope this gets fixed before league launch because I love to hear dialogues and item filter sounds.

Forgot the mention that I was leveling a minion build and was playing with raise zombie. Might help to find the source of the problem.