Detecting bundles with more than 3 tags

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I'm trying to detect a ar_track_alvar bundle with five tags but it only detects the first three tagfrom the xml.

Is it possible to detect bundles with more than three tags?

My xml looks like:

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<!-- radius: 4,2 cm -->
<multimarker markers="3">
<marker index="1" status="1">
    <corner x="-1.5" y="-1.5" z="0" />
    <corner x="1.5" y="-1.5" z="0" />
    <corner x="1.5" y="1.5" z="0" />
    <corner x="-1.5" y="1.5" z="0" />
</marker>
<marker index="10" status="1">
    <corner x="-1.5" y="-1.5" z="4.24" />
    <corner x="1.5" y="-1.5" z="4.24" />
    <corner x="1.5" y="1.5" z="4.24" />
    <corner x="-1.5" y="1.5" z="4.24" />
</marker>
<marker index="9" status="1">
    <corner x="-3.8" y="-1.5" z="2.04" />
    <corner x="-2" y="-1.5" z="4.21" />
    <corner x="-2" y="1.5" z="4.21" />
    <corner x="-3.8" y="1.5" z="2.04" />
</marker>
<marker index="11" status="1">
    <corner x="1.8" y="-1.5" z="2.2" />
    <corner x="3.9" y="-1.5" z="4.23" />
    <corner x="3.9" y="1.5" z="4.23" />
    <corner x="1.8" y="1.5" z="2.2" />
</marker>
<marker index="12" status="1">
    <corner x="4" y="-1.5" z="1.44" />
    <corner x="3.9" y="-1.5" z="-1.56" />
    <corner x="3.9" y="1.5" z="-1.56" />
    <corner x="4" y="1.5" z="1.44" />
</marker>
</multimarker>