PVS-Studio warning V517 for saga

CSG_String CWatersheds_ext::GraveliusType(....) {
  ...
  if (fGraveliusIndex > 1.75) {
    sType = "Rectangular";
  }
  else if (fGraveliusIndex > 1.5) {             <<<---
    sType = "Ovalooblonga-rectangularoblonga";
  }
  else if (fGraveliusIndex > 1.5) {             <<<---
    sType = "Ovaloredonda-ovalooblonga";
  }
  else {
    sType = "Redonda-ovaloredonda";
  }
  ...
}

This suspicious code was found in saga project by PVS-Studio static code analyzer.
Warning message is:
V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 697, 700. ta_channels watersheds_ext.cpp 697

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/