Inconsistent ties ?

[steve]

    I have a  problem with 2 similar ties that are treated differently. Here
is a simplified example.


\version "2.16.2"

\score {
        \new Staff {
        \relative c'' {
        \time 3/4
        \clef "G_8"
        \key g \major
        \stemDown g8 [ fis ] e [ d ] ~ d [ e ]   |   e [ d ] c [ b ] ~ b [
c ]   |
        }
    }
}

       The  tied "d" in the first bar is quite different than the tied "b"
in the second.
The "d" is joined from the top of the head. The "b" is joined differently.
The bars
are identical except one is a minor third lower. Both slurred notes are on
lines
and have identical beaming, stem direction.. etc.. shouldn't the ties be
identical also?

       Here is a link to a pdf.

http://indra2.web.net/~linuxsui/gooeytar.com/public/lilypond/tst.pdf

          --steve