Do you have the same issue if you follow the OP’s steps to reproduce it?
Yes. Also, the flight director knows something is wrong and jiggles from left to right a bit.
Provide extra information to complete the original description of the issue:
I am flying quite long legs in the Caribbean, around 250 miles.
At the poster above said, switching from MAG to TRUE in the FMS units menu makes the aircraft turn a bit (it shouldn’t - it’s just an instrumentation change), but it still doesn’t get me back on track.
In the screenshot below, I’m shown on the nav display as being 4.0 miles to the right of my track. But the line is drawn on the other side. The purple lines on the nav display and below the PFD are opposites. Something is screwed up in the way the aircraft shows and tries to follow its path.
If relevant, provide additional screenshots/video:
