I believe this has something to do with your palettes.
When I looked at the pallets, I saw three different ones ({1}, {2, 3}, {4, 5, 6}) -> So, because of the different palettes, there will be mix ups and errors.
Image 1's Palette:
Image 2&3's Palette:
Image 4,5&6's Palette:
I think that you need to somehow merge the palettes. I tried it for one, (image 2) and I managed to get it to work with 4, 5, 6.