motion path animation isn't working correctly

I have an object that I want to look like it is moving on top of a piece of rope from one side of the slide of the slide to the other. I drew a custom animation path from the left to the right. Then I duplicated my object in the exact spot on the right where it landed, and then drew a custom motion path from the right back to the original spot on the left of the slide. The original object I have disappear at the same time it's dupe appears and starts traveling back to the original spot. That way it looks to be one object going back and forth across the slide.

This all works in powerpoint, but when I publish, not only is timing off (which I can adjust till it's right), but my original object won't disappear, so I ended with it sitting on the right of my slide after the first motion path.

I attached the file.

Thanks!