Whatever you used to interpret your post did not do a good job. I do not understand what you mean by a footage shadow.
Also, you have not given any of the information people will need to know to solve any technical problems.
As Szalam said, you need to explain better and provide the necessary information. If you have some sort of ghosting issue, provide screenshots of your comp and your timeline with keyyframes and things like transparency properties revealed if this is relevant.