Real Time Interface Monitor is not working.

I'm sitting on my machine and I copy a large file to another machine so I can watch the traffice. I'm getting aroun 99% of my 1Gb interface used, according to task manager... however, the real-time monitor on OpManager is claiming I'm getting 10Gb of traffic.... on a 1Gb interface.

Further, I've noticed that on all machines, the amount of traffic listed in the normal utilization graph is odd... on the server end, I get a very low value, but tracking the traffic on the switch port to which that machine is connected, I get a much higher value.. how can this be?

This happens on all machines that I've looked at.

Can you help me correct this, please?