Miss same position of note head

[Inxman]

Hi there,
i don't understand why the note heads in the middle of this snippet do not share the same place? I do not see the mistake. Can someone help me?

\version "2.19.33"
upper = \relative c'' {
       \clef treble
       \time 4/4
       <<
           { a4 g8. [f16] }
         \\
          { a16 [a, c f] g [g, b f']  }  
      >>
}

\score {
   \new GrandStaff 
         \new Staff = upper { \new Voice = "singer" \upper }
}
Best regards,
Ingo

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