Disconnected and oddly placed stems

[Dan Florio]

Here are the first few measures of a guitar part in a tune I'm working on:

(Each line represents a measure)

\version "2.12.2"

\header
 {
    title = "Percussion Song"
    composer = "Dan Florio"
 }

Guitar = \relative c'
 {
    << e1 g d' g >>
    << e, g d' fis >>
    << ees, g des' fis >>
    << ees,2 g des' f >> << ees, g des' e >>
 }

\score
 {
    <<
    \new Staff = "Guitar" { \Guitar }
    >>

    \midi { \context { \Score tempoWholesPerMinute = #(ly:make-moment 
275 4) } }
    \layout { }
 }

I've attached the pdf of that specific part.  Notice how the stems in 
the fourth measure are disconnected and opposite.  Anyone know why this 
is happening, and how I can fix it?

LatinPercussion2.pdf
Description: Adobe PDF document