Two things come to mind:
1) make sure that your project properties are set to match the video event sources. When you go into “Project Properties”, there is a little folder icon in the upper right corner that will help you select a source file and set the proejct properties auto-magically to match.
2) You can try to set, on all of your video events, the “Disable Resample” switch. Select all of your vide events, right click, “Switches”, “Disable Resample”. That should remove the ghosting.