I've noticed this as well, for some reason this makes me also wonder about the SFX of a goblins bomb toss, it sounds like its extremely low quality sound, and all garbled sounding. its prob working as intended, the bomb thing anyhow.. but id expect it to sound better then what it is now. More on topic tho it sounds like the game is limiting the number of SFX that can be heard at anyone one time. I think FFXI had a setting to adjust how many SFX that can play, so maybe theres something in the game like that idk.