Orion NPM polls and uses the Interface speed set to compute for Percent utilization for your bandwidth - by default (IfSpeed 1.3.6.1.2.1.2.2.1.5). For some that you are trying to monitor the WAN interface - you need to set a custom bandwidth on the Interface details page - set the bandwidth by your provider (both upload and download speed).
1. Login in to your Orion web console
2. Drill down to the interface page for that interface
3. there will be a button that says >> Edit interface
4. Check Custom Bandwidth
5. Set the appropriate speed
6. save the settings.
I did that and nothing changed.
Thanks
D