From what I can gather about the program, the palette colors of each image are different. For example, The legs have less colors than the upper portion, causing it to glitch up like that. However, since the "sync palette" option breaks the sprites I don't see a way around it. I've had the same problem for quite some time with my own sprites, as well. As you can see from this video, I for one haven't figured it out just yet:
I'm still looking into the issue, I think something may be able to be done up right when the file is inserted into the narc with Tinke, but I can't be sure on that just yet.