Likewise, this issue still persists in the current SU9 public release, 1.25.7.0.
Vive Pro headset, here.
I figured out what provokes the mouse ‘splitting’ between eyes: It’s certain viewpoints. In my case, the “left-eye” mouse remains the primary mouse that will toggle things in the cockpit.
In the Concorde, sitting in the default position, things are fine, but if I lean my head back into the “flight engineer’s” view window, OR use the Ctrl+0 toggle to go back the flight engineer’s positon, the mouose splits. In the concorde, the split persists even if I return to the default view via hotkey
In the FBW A320, it’s similar, but slightly different. Almost all Ctrl+# viewpoints split the mouse, but in the A320, the default viewpoint via hotkey, returns the mouse to its proper place