WAN Optimization Reports Negative values

I have recently installed some new Riverbeds and am trying to set up the WAN Optimization reports.  I have verifired via the Cable Swap test on the device that my wan side is using wan0_0. In my custom properties I put the interface ID of wan0_0 in the OptimizedInterfaceID field of Lan0_0. Yet the reports still show pre interface lan0_0 post interface wan0_0 with pre bytes 235 Mb and post bytes 940Mbs. Any ideas?

Tricia.