MagnifyStaff Bug?

[Carl-Henrik Buschmann]

I’m trying to typeset a very simple piano and violin arrangement and while doing the piano part I wanted to have the violin staff «cue sized» as a reference to the pianist. I used \magnifyStaff and while it works wonders, it gives me this at the end of each system:

http://i.imgur.com/6UNkJkA.png

This is weird. Any idea why this happens? Is there perhaps a better way of doing this?

\score {

    <<

      \new Staff \with {

        \magnifyStaff #5/7

        instrumentName = #"Violin "

        shortInstrumentName = #"Vln. "

      }

      {

        <<\melody \violinDynamics \repeatBars>>

      }

      \new PianoStaff  \with {

        instrumentName = #"Piano "

        shortInstrumentName = #"Pno. "

      }

      <<

        \new Staff = "Right" <<\pianoNotesRight \repeatBars>>

        \new Dynamics = "Dynamics" \pianoDynamics

        \new Staff = "Left" <<\pianoNotesLeft \repeatBars>>

      >>

    >>

  }

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