When making sprites, there are a couple of things you need to keep in mind. One of the most important of these, frames. gE cuts up the image you give it into x number of frames. Since your image had a width of 64, it cut it into 3 frames of 21, essentially. The point being that it makes even frames from the picture. Your sprites characters were not evenly spaced, throughout the image. You need to think of the cutup image while making the sprite. If you don't get it, this might help with making sprites.
http://game-editor.com/forum/viewtopic.php?f=8&t=6547