strange position of tuplet number

[Stefan Thomas]

Dear lilypond-users,
in the below quoted example the positions of the tuplet numbers are very strange. Is it possible, to have the tuplet numbers automatically near to the beams?

\version "2.11.49"
re = { \change Staff = rechts }
li = { \change Staff = links }
rechts = { \clef bass  s 4. }
links = { \clef bass
    \time 3/8
    \times 4/5 { \clef "bass" < g, g,, > 32 [ des, aes, \re \stemDown c d]  } \times 4/5 { \re  b[  d des c \li \stemUp aes, ] } \times 4/6 { des, [g, c \re \stemDown d g gis] }  | %klavier eins links Takt 115
}
\score {
\new PianoStaff = "Klavier"
        <<
        \new Staff= "rechts" { \rechts }
           \new Staff = "links" \with {
    { \links} >>   
}