Some textures don't seem to dump?

[MayImilae]

I don't know your method exactly so I can't give you specific help yet. But for me, the usual reason I encounter this is simply because I turned on texture dumping before entering area, thinking the game would load a texture for that area upon entering that area, however the game had loaded the textures beforehand and I simply missed it. That is likely what you are encountering as well? I recommend just turning on dumping before even starting the game to make sure you get absolutely everything.