The issues with ghost images usually come up when both a fade in and a fade out are selected. It can only be one or the other. So instead of "leave in place" you could use the transition "alpha blending" as the fade in and then "none" as the fade out. And for the final element (photo/video clip) use "leave in place". That way each image will go away because the next image has faded in and then only the last piece of media will stay at the end of the show.