Audio issue/bug

I'm unsure if this is just oversight, or if it's an audio bug, but I really doubt it's intended. In the third act, within the forest, there is an audio issue causing a very high pitched noise to be played in the soundtrack, think like an old school tv, people who are 40+ or listened to too much music too loud might not hear it due to it's high pitch, but there is a constant, and quite loud, high pitched noise playing on some of the maps. It goes away intermittedly when battle is going on, but when it returns to full music in-between fights, the high pitched noise is there.

To replicate, just go to the Matlan waterways for a clear consistent example in the soundtrack.