Reversed upside-down text on vtkCubeAxesActor

I’m using VTK 8.2. When I display axes titles and tick
labels on vtkCubeAxesActor, the text is reversed and upside-down. What could cause this?

  axesActor_ = vtkSmartPointer<vtkCubeAxesActor>::New();
  int use3D = 0;
  axesActor_->SetUseTextActor3D(use3D);
  axesActor_->SetXTitle("Easting");
  axesActor_->SetYTitle("Northing");
  axesActor_->SetZTitle("Depth");

Thanks
Tom