(Lol, sorry Sura, my phone likes to tell everyone I'm offline. owo)
But the only thing I can think of is what I call the random derp glitch (totally legit & well thought out name, I know xD) , where everything can be correct but for some reason FeralHeart is like "LOLNOPE."
I've had people with really strange issues that can't be fixed, such as eyes half closed, transparency issues and whatnot.
The only thing that seems to (sometimes, not always) fix it is redoing the material code, which Sura or I would do for you. Sometimes you just gotta mess around with it until it works, so if you're up for that, you could give it a shot yourself. c;