PVS-Studio warning V581 for MongoDB

string _server;

bool operator<( const ServerAndQuery& other ) const {
  if ( ! _orderObject.isEmpty() )
    return _orderObject.woCompare( other._orderObject ) < 0;

  if ( _server < other._server )
    return true;
  if ( other._server > _server )
    return false;
  return _extra.woCompare( other._extra ) < 0;
}

"A<B" is the same as "B>A".

This suspicious code was found in MongoDB project by PVS-Studio static code analyzer.
Warning message is:
V581 The conditional expressions of the 'if' operators situated alongside each other are identical. Check lines: 44, 46. parallel.h 46

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/