PVS-Studio warning V537 for Source SDK

class ALIGN16 FourVectors
{
public:
  fltx4 x, y, z;
  ....
};

FourVectors BackgroundColor;

void RayTracingEnvironment::RenderScene(....)
{
  ....
  intens.x=OrSIMD(AndSIMD(BackgroundColor.x,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.x));
  intens.y=OrSIMD(AndSIMD(BackgroundColor.y,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.y));
  intens.z=OrSIMD(AndSIMD(BackgroundColor.y,no_hit_mask),
                  AndNotSIMD(no_hit_mask,intens.z));

  ....
}

This is what should have been written here: intens.z=OrSIMD(AndSIMD(BackgroundColor.z,no_hit_mask), AndNotSIMD(no_hit_mask,intens.z));

This suspicious code was found in Source SDK project by PVS-Studio static code analyzer.
Warning message is:
V537 Consider reviewing the correctness of 'y' item's usage. Raytrace trace2.cpp 189

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/