There's also the aggrieved complainant issue, where some prisoners (and people in general) will use anything as an excuse to piss and moan about how unfair everything is to them (even though they're being treated identically to others) and will file endless timewasting complaints. I suspect that some prisoners have realized that claiming to identify as women moves them from "yeah, he's always been like this, ignore" category to "better grease that squeaky wheel before Stonewall sends the flying Twitter monkeys after you" category.
Personality disorders are a thing and they're overrepresented in the prison population.
(We have one of the vexatious, permanently aggrieved people pestering my workplace currently, and I'm having to remind myself that "off you fuck, pet" is not a professional thing to say frequently.)