There's a specific NPC model (shown in the screenshot) which has inconsistent voice responses. The NPC is always female, has always the same face-hairstyle combination, but clothes, skin tone and hair color can change.
When left alone, the NPC uses the hip swaying walk animation and when bumped into will shout or grunt using female voice pool. When interacted with though, it switches to a male voice, but grunts keep getting chosen by the female voicelines pool
When left alone, the NPC uses the hip swaying walk animation and when bumped into will shout or grunt using female voice pool. When interacted with though, it switches to a male voice, but grunts keep getting chosen by the female voicelines pool