Sprite editing problem

[CoolPorygon]

I am making a hack and I'm currently using unLZ to replace the sprites. When i look through the "sprite list" for firered, I see a normal front view, then a shiny back view, then the next pokemon. So i guess my first question is is that normal? I finally figured out how to insert the front view for a pokemon, but im having trouble with the back. When i first changed the front, the back became all warped and weird despite the fact i hadn't changed it yet. Only now do i realize that it took on the pallette of the front view, but switched around the shades so its eyes were red, red was white and so on. I tried inserting my desired sprite into the shiny back slot, but it did the same thing only with this one's palette. Am I doing something wrong? Please help me...

P.S. If you want to help me make this hack I am still looking for people to join the team. It's called Pokemon Magikarp Version. All the pokemon are magikarp hybrids and you and all other humans are magikarp. All hail magikarp!!!!