My character is a human male, as you can see in this first screenshot:
I've discovered when I use the Holo-Decoys trait on Nukara and with an environmental suit equipped, the decoys that spawn are Na'kuhl females instead, like so:
As you can see, it seems to happen in multiple different suits. Oddly enough, it only happens on Nukara. I've tested it on a couple other random ground maps with an EV suit equipped, and the decoys reflect my actual appearance there. I've never noticed an issue if I don't have an EV suit equipped at all or enabled visually, regardless of location.