Sprites are messed up

[OverLoadedPanda]

I'm not sure if anyone even looks at this section anymore, or if anyone even uses Gen III rom hack suite anymore, but since I'm using mac it's the only thing I have. Anyways my question is, why do my sprites always mess up when I add a front sprite and a back sprite? It's hard to say but just look at the pictures...

Okay so this is the first one:
(female elmo, don't ask me why...)

and this is the from the back view image:

Yet when I put it into hacking suite it looks like this:

I have no idea how to fix this.

And it's not just the colours in this image, it happens in other images too...
I can provide more examples if necessary.

Thank you for any help, it is much appreciated!