I noticed that in the FAA enroute charts, low altitude airways in the US such as Victor airways are depicted in black and T routes are depicted in blue. In Navigraph 8, I noticed that the colors are reversed.
With high altitude airways, I’m seeing the same thing. The FAA depicts the routes such as jet routes in black, and Q routes are in blue. However in Navigraph v8 the color depictions are reversed.
Are you basing the color coding on a different source? I know I quoted the US, but then I wondered if you were facing the color coding from a different system.