PVS-Studio warning V517 for Geant4

G4double
G4PropagatorInField::ComputeStep(
                G4FieldTrack&      pFieldTrack,
                G4double           CurrentProposedStepLength,
                G4double&          currentSafety, // IN/OUT
                G4VPhysicalVolume* pPhysVol)
{
  ....
  if( stepTrial > 100.0*fZeroStepThreshold )
    decreaseFactor = 0.35;     // Try decreasing slower
  else if( stepTrial > 100.0*fZeroStepThreshold )
    decreaseFactor= 0.5;       // Try yet slower decreases
  else if( stepTrial > 10.0*fZeroStepThreshold )
    decreaseFactor= 0.75;      // Try even slower decreases
  else
    decreaseFactor= 0.9;       // Try very slow decreases
  ....
}

This suspicious code was found in Geant4 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: 227, 229. G4navigation g4propagatorinfield.cc 227

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/