I think it’s the fact it’s a pink hole with not much else going on around it. Like sure, it looks neat and not rotted like the rest of the horrors in the thread, but if you were looking at this as if it were a true and honest pussy, where are the labia minora for example? It genuinely looks like stage 2 FGM, it’s just a hole. Even the most aesthetically pleasing real vulva you’ve ever seen still has visible and/or wonky inner labia, a clitoral hood/clitoris, and tissue surrounding it. It looks natural, flawed, and human, not perfectly symmetrical, neat and flat.
It looks like everything’s just been shaved off, leaving a reeking hole. It looks off because it looks like what it is - a rancid surgically-crafted unnatural hole. It’s just not obscured by mounds of rotting ballsack skin like the rest of them.
I also agree that the image looks like it’s been filtered to death.