Like… there are probably a huge number of things that result in creating LGBTQ people, in utero, genetic, early experience, and like there can be a huge number of each of those that result in gender or sexuality stuff in a huge variety of ways. Like some might be endocrine some might be neurological some might be psychological some might be a bunch of other stuff. The idea that there must be one single mechanism for this stuff is really pretty obviously wrong. There are probably a whole bunch of mixes of a whole bunch of stuff that create things.
Like humans are complicated AF.