Auto-animate only previewing between 2 artboards but not whole preview.

Hi All,

Need some help. I've created a sliding image using auto-animate. The image is placed on the left in the 1st artboard and on the right in 2nd artboard. It previews correctly between the two artboards but when I playback the entire sequence the image simply appears and there is no animation. All other actions/animation work though. Can anyone help me fix this or know what's going on?