Incorrect mutual edge weight on Preview

With directed graphs, the Preview mode display wrongly mutual edges weight

See http://forum.gephi.org/viewtopic.php?f=4&t=421&start=0

Dataset:
<?xml version="1.0" encoding="UTF-8"?>
<gexf xmlns="http://www.gexf.net/1.1draft" version="1.1">
<meta lastmodifieddate="2009-03-20">
<creator>Gexf.net</creator>
<description>First test of manually encoded data</description>
</meta>
<graph mode="static" defaultedgetype="directed">
<nodes>
<node id="Canada" label="Canada"/>
<node id="France" label="France"/>
<node id="Germany" label="Germany"/>
<node id="Italy" label="Italy"/>
<node id="Japan" label="Japan"/>
<node id="United Kingdom" label="United Kingdom"/>
<node id="United States" label="United States"/>
</nodes>
<edges>
<edge id="0" source="Canada" target="Canada" weight="1"/>
<edge id="0" source="Canada" target="United States" weight="0.1940814"/>
<edge id="0" source="Canada" target="United Kingdom" weight="0.05427539"/>
<edge id="0" source="Canada" target="France" weight="0.03898933"/>
<edge id="0" source="Canada" target="Germany" weight="0.03849978"/>
<edge id="0" source="Canada" target="Japan" weight="0.02061038"/>
<edge id="0" source="Canada" target="Italy" weight="0.01953261"/>
<edge id="0" source="France" target="France" weight="1"/>
<edge id="0" source="France" target="United States" weight="0.1077264"/>
<edge id="0" source="France" target="Germany" weight="0.0728741"/>
<edge id="0" source="France" target="United Kingdom" weight="0.07065262"/>
<edge id="0" source="France" target="Italy" weight="0.05412602"/>
<edge id="0" source="France" target="Canada" weight="0.03214583"/>
<edge id="0" source="France" target="Japan" weight="0.02109785"/>
<edge id="0" source="Germany" target="Germany" weight="1"/>
<edge id="0" source="Germany" target="United States" weight="0.1216888"/>
<edge id="0" source="Germany" target="United Kingdom" weight="0.06792334"/>
<edge id="0" source="Germany" target="France" weight="0.05264217"/>
<edge id="0" source="Germany" target="Italy" weight="0.03914655"/>
<edge id="0" source="Germany" target="Canada" weight="0.02292966"/>
<edge id="0" source="Germany" target="Japan" weight="0.02178827"/>
<edge id="0" source="Italy" target="Italy" weight="1"/>
<edge id="0" source="Italy" target="United States" weight="0.1140013"/>
<edge id="0" source="Italy" target="United Kingdom" weight="0.07024939"/>
<edge id="0" source="Italy" target="Germany" weight="0.06835502"/>
<edge id="0" source="Italy" target="France" weight="0.06827214"/>
<edge id="0" source="Italy" target="Canada" weight="0.02031312"/>
<edge id="0" source="Italy" target="Japan" weight="0.01573507"/>
<edge id="0" source="Japan" target="Japan" weight="1"/>
<edge id="0" source="Japan" target="United States" weight="0.08040417"/>
<edge id="0" source="Japan" target="Germany" weight="0.0216889"/>
<edge id="0" source="Japan" target="United Kingdom" weight="0.02057521"/>
<edge id="0" source="Japan" target="France" weight="0.01517098"/>
<edge id="0" source="Japan" target="Canada" weight="0.01221913"/>
<edge id="0" source="Japan" target="Italy" weight="0.008970295"/>
<edge id="0" source="United Kingdom" target="United Kingdom" weight="1"/>
<edge id="0" source="United Kingdom" target="United States" weight="0.1173371"/>
<edge id="0" source="United Kingdom" target="Germany" weight="0.06280775"/>
<edge id="0" source="United Kingdom" target="France" weight="0.04719359"/>
<edge id="0" source="United Kingdom" target="Italy" weight="0.03720145"/>
<edge id="0" source="United Kingdom" target="Canada" weight="0.02989074"/>
<edge id="0" source="United Kingdom" target="Japan" weight="0.01911277"/>
<edge id="0" source="United States" target="United States" weight="1"/>
<edge id="0" source="United States" target="United Kingdom" weight="0.03615102"/>
<edge id="0" source="United States" target="Germany" weight="0.0346681"/>
<edge id="0" source="United States" target="Canada" weight="0.03293082"/>
<edge id="0" source="United States" target="Japan" weight="0.0230114"/>
<edge id="0" source="United States" target="France" weight="0.02216981"/>
<edge id="0" source="United States" target="Italy" weight="0.01859997"/>
</edges>
</graph>
</gexf>