Tusk Grineer using wrong grunts on hit

[Katinka]

This has been happening for a while but I've only just got round to testing in Simulacrum to confirm my suspicions.  Various male Tusk Grineer (Lancers, Elite Lancers, Troopers etc.) are occasionally using the female Grineer grunt when hit.  For a while I'd been confused by this as I'd by trying to spot the Ballista or Heavy Gunner that I'd heard and must be lying in wait somewhere about to attack but really it was just an unusually high pitched Trooper.  Only seems to affect the Tusk (Plains) brand of Grineer.