Wrong part found while looking at CfgAmmo.

class gm_missile_maljutka_heat_9m14: gm_missile_maljutka_base
{
model = "\gm\gm_weapons\gm_launchers\gm_maljutka\gm_maljutka_heat_9m14m_armed";
submunitionAmmo = "gm_penetrator_maljutka_HEAT_9m14m";
};
class gm_missile_maljutka_heat_9m14m: gm_missile_maljutka_base
{
model = "\gm\gm_weapons\gm_launchers\gm_maljutka\gm_maljutka_heat_9m14m_armed";
submunitionAmmo = "gm_penetrator_maljutka_HEAT_9m14";

9M14 and 9M14M are switched.

Maybe there's something else that I haven't found.