Take a look at the following guide:
It could be that your edge firewalls, or your ISP, are blocking some of the ports required for NetPath to function correctly. First, make sure your house is in order by ensuring all required ports are open between your Orion poller (or the agent which is running the path) and the egress point of your network. Once done, check back in a few hours to see if the divergent routes are being plotted. If not, then the issue could be down to your ISP blocking some of the ports. That's a tougher nut to crack, and one you'd need to deal with them directly to resolve.
For additional brain food, check out this video:
Finally, if you have time, check out this episode of SolarWinds Lab:
It's all about NetPath =B']
Hope this helps you get to the bottom of your problem! NetPath is awesome, I hope you get it all working!
Take a look at this article this seems to be what you are describing also when you open this article look at the related articles as well.