Netflow and per-packet load balancing

I just started using the demo version of NFA 5.5 and I'm running into a problem. I'm monitoring two serial interfaces on a router and I'm getting anomalous results that I think are being caused by per-packet load sharing. The problem is that the output utilization charts and tables are often going well over 100% of the link speed. The link speed is configured correctly and the active timeout is one minute.

With per-packet load sharing, traffic for a given destination will be even split between the two circuits. It looks like NFA doesn't know how to handle per-packet load sharing situations. When I look at a chart for a single interface, it appears that NFA is including information from both interfaces.

Do you have any insight into this?

Thanks!
John