PVS-Studio warning V576 for TinyCAD

CString COption::PointToDisplay(CDPoint a, BOOL horiz)
{
  ....
  if (horiz)
  {
    r.Format(_T("%9.03f"), sy,
             GetUnits() == 0 ? _T("mm") : _T("\""));
  }
  else
  {
    r.Format(_T("%9.03f"), sx,
             GetUnits() == 0 ? _T("mm") : _T("\""));
  }
  ....
}

This suspicious code was found in TinyCAD project by PVS-Studio static code analyzer.
Warning message is:
V576 Incorrect format. A different number of actual arguments is expected while calling 'Format' function. Expected: 2. Present: 3. option.cpp 266

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/