Animated gif leaving trails

I am creating an animated gif in imageready with a transparent background, but when it animates it shows all of the frames stacked on top of each other instead of one frame at a time. So when I watch the animation there is a trail of previous frames behind the object. How do I fix this? My original file is a multiple layered photoshop file with a transparent background.

Here is an example of what it looks like. Help!