[graphviz-interest] edge doubling (?)

I don't understand why, with the attached dot file, graphviz 2.38 on windows
outputs the attached png with the following command line
>  dot _accenti-completo-000.ps2.dot | neato -n2 -Tpng -O
doubling the edges...

If non style=invis edges in the dot file are style=tapered the problem
disappear.

I don't understand why dot _accenti-completo-000.ps2.dot output, in the
first case contains edges attributes pos="e,....;e," with 2 'e,...' and if
it is related with the problem above, as I'm believing that the two 'e,...'
are defining the two edges.

Many thanks,
Federico Spinazzi

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