Furries are just a vocal minority, and so are females, to a lesser extent.
No male user is ever really going to point out the they're a man, but female users tend to end up in situation where someone calls them she, or some other situation where there is gender confusion, and they have to correct someone, making them a slightly vocal minority of the NG userbase.
Then there's the furries. A small group centered around, what, in the end, is a sexual fetish. Most of them are in the closet about it in real life, but online, no-one's gonna throw a brick at you for admitting furrydom, so they're more vocal about it. Then, they meet other furries online, so off course they will form their own clique, which will off course, start showing.
Then add the fact that women make up 50 % of the population (and of the Furry Fandom), and furries are a miniscule minority irl, the laws of probability come to play.
So yeah, though I don't have any actual cencus on this, I'm pretty sure there are more women on NG than furries.