Course Data Displaying Wrong

I have a Navnet with three plotters connected. Two 7 inch and one 10.4 inch. One of the 7 inch is the main unit with the GPS / Radome and PG1000 and network connected.

The issue I have is when i'm navigating a course, the main 7 inch display shows the wrong course data and it's somewhat erratic. The other two plotters show the correct course.

I use the 10.4 inch to set the course.

See attached photo of display. The bearing is indicating 105.9 which is correct however the course is indicating 353.6 and it actually jumps around quite erratically.

The other two stations displayed the course correctly with some minor variance close to 106 degrees.

Is there a setting I need to change?

It sounds like you have a data loop in the configuration of your settings. I would recommend calling tech support from the boat to talk over your wiring and setting for your NMEA ports and output though network.