Ditto what Captain says. Since you say you are running Symposium 4.5, I take that to mean you are running Symposium Web Client 4.5.
Web Client real time displays have a noticeable lag with actual real time. First, there is a ~6 second delay between the SCCS and SWCS and then there is another 1-2 second delay to get the actual Real Time Display info sent out to the client machine.