Bad rest placements?

[steve]

    Howdy?

           So I have been working on an engraving and had 80% of it
 finished  when I decided I needed another voice. I added it and it solved
my voicing
 issue, but it completely ruined ALL of my previous rests which were fine
 before. I don't see why these rests should be so badly out of position???

   http://www.gooeytar.com/projects/test/test4.pdf
   http://www.gooeytar.com/projects/test/test4.ly

       The rests in voicethree are way out! Sure I could use  "\rest"  for
 each one but shouldnt  this just work??

   Here is a minimal reduction of the problem.  Ideas?  thanx - steve

 \version "2.18.0"

  global = {
     \time 3/4
     \key e \major
     \clef "G_8"
  }

  voiceone = \relative c' {
     \repeat volta 1 {
         \partial 4 { e'16_\p b gis' e } |
         b'4 r gis,16 e b' gis |
         e'4 r gis,,16 e b' gis |
         < a fis' >4 < gis e' >
     }
  }

  voicetwo = \relative c' {
     s4
     \repeat unfold 2 { s2. } s2
  }

  voicethree = \relative c {
     \stemDown
     \repeat volta 1 {
     \partial 4 s4 |
     r4 < e gis b > r | r4 < e, e' gis > r |
     e2
     }
  }

  guitar = << \voiceone \\ \voicetwo \\ \voicethree >>

  \score {
     \new Staff { << \global \guitar >> }
     \layout { }
  }