You will see this "ghosting" effect if BI misses or drops an I frame. An I frame contains the entire image, while the P frames that are sent between I frames contain only what has changed since the last frame sent.
In my experience, the most common issue that causes frames to be lost (or perhaps discarded) is when BI expects a particular FPS from the camera, but the camera settings have it sending a video stream with a higher frame rate. So if BI has the camera settings configured for a Frame Rate of 20, and to "Adjust automatically", but the camera is set with a Frame Rate of 30, BI will have to try to adjust to this higher frame rate. In this scenario, I think BI tends to drop a few frames, and if one of those is an I frame, you will see the ghosting effect.
My preference is to set BI to expect a slightly higher frame rate than what the camera is sending. I like to set the camera to a frame rate of 20, and then in BI, set the frame rate for the video stream to 22.5.