Recently, rendering of faces in FF seems to have gone sharply downhill, a kind of "giant leap backwards" to more primitive days.
I was testing an innocuous prompt ("Native Americans on horseback, prairie scene") and got some quite disturbing and grotesque "humans" with faces reminiscent of the earliest iterations of FF. I was interested to note that FF web app, Photoshop's Generate Image, and Generative Fill all returned heavily distorted human figures, but Generate on Adobe Stock returned images that were at least not actively offensive. Using "Art" rather than "Photo" improved results in all cases.
This is also the first time I can recall getting results that were actually disturbing to look at. I spend most of the test session giving negative feedback. FF has never been flawless rendering human figures, but I haven't seen anything quite as bad as this in a long while.