Final Fantasy Hacktics

Ok, I have a decent amount of knowledge when it comes to stuff like this but for the life of me I cannot figure this out. The custom sprites work just fine.. however, certain animations are glitched/blacked out (so to speak.) For instance, the start of the game in the monastery when Ramza kneels down his custom sprite changes to what appears to be the original sprite but inverted (black and white.) I'm assuming this is normal? Err, I've looked up and down these forums and I can't really find anything regarding this. It might just be my own stupidity but I've run out of ideas... any help?