Dynamic collisions

[TaoCG]

I'm getting a lot of colliding dynamics like in the attached pdf. 
sf_03_m14.pdf
<http://lilypond.1069038.n5.nabble.com/file/n133884/sf_03_m14.pdf>  
If I try to isolate that specific measure the dynamics don't collide:

\version "2.16.0"

\score
{
  <<
    \new PianoStaff
    <<
      \new Staff \relative c'''
      {
        \override Score.Hairpin #'circled-tip = ##t
        \override Score.Hairpin #'minimum-length = #10
        r4 \times 2/3 { r8 d4~\< } \times 2/3 { d8\pppp\> r4\! } r4
      }
      \new Staff \relative c'
      {
        \clef F
        <<
          { r16 d4..~^\< d\p\> r16\! } \\
          { r2 \times 2/3 { r4 c8~\< } \times 2/3 { c\f\> r4\! } }
        >>
      }
    >>
  >>
}

Does anyone have an idea what might be causing this and how to resolve it?




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