How does HDR usually work?
The traditional HDR method is based on bracketing and compiles three exposures of the same image : underexposed, well exposed and overexposed.
The flip side of this method is what we call “ghosting” effects. Since bracketing consists of combining consecutive shots, any moving subjects in your scene will be moving across each image, making your subjects look like ghosts in your final results. Therefore, this method requires to keep the camera stable and shoot still subjects.