Brand new here and didn't know where to post this. Is this throw big window known? Am I just going crazy???
You're not going crazy, that's the way it's supposed to be!
Really? Yes. All KOF's have been like this. What happens is, all normals have 4 frames input lag (so A, B, C, D) all specials have 1 frame input lag, and AB,BC,CD have 0 frames input lag. Or at least, that's how it has always been in older KOF's. Not sure if these numbers have changed, but input lag is still there.
So, if you press C, and then forward within 4 frames, C hasn't started yet, and the game registers f+C instead, which is a throw.
It's kind of annoying, the answer is pretty much pressing the forward somewhat later, you have plenty of time.