yep, i played around with upgrade paths a little for svartalfar because of the male units. instead of their scouts being able to upgrade to horsemen&hunters, i made them able to upgrade to hunters&archers (and thats part of the reason i gave scouts 1 movement actually, so that upgrading to archers wouldnt lessen its movement) so theyd stay the same gender.
workers took the place as the first tier horseman, since slaves are male, and the pre-existing svartalfar horseman was male and less white skinned, looking like a light elf almost. they can then upgrade up the horseline, or they can upgrade to pikemen (which are also male). the horseline later gets mixed gender, with 1 male and 2 females, when they reach horsearchers, to make sense of which i made archers upgradeable to horsearchers.
so ya, supposed to happen, to preserve gender across upgrades.