XSL format-number spews garbage in first row, subsequest rows formatted correctly

[codeproblems]

============= XML content ==================

<?xml version="1.0"?>
<cdb>
<spill>
<ctx_volume>142300000</ctx_volume>
<date>19670318</date>
<shipname>TORREY CANYON</shipname>
</spill>
<spill>
<ctx_volume>20400000</ctx_volume>
<date>19670905</date>
<shipname>R C STONER</shipname>
</spill>
<spill>
<ctx_volume>25000000</ctx_volume>
<date>19671024</date>
<shipname>GIORGIO FASSIO</shipname>
</spill>
</cdb>


============= XSL Stylesheet ==================


<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" indent="yes" omit-xml-declaration="yes"/>
<xsl:template match="/">
<xsl:for-each select="cdb/spill">
<xsl:sort select="ctx_volume" order="descending" data-type="number"/>
<xsl:value-of select="shipname"/>
<xsl:text>-</xsl:text>
<xsl:value-of select="format-number(ctx_volume, '###,###,###')"/><br />
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>


============= OUTPUT ==================

TORREY CANYON-142ÿ00ÿ00 <------------ PROBLEM!!!!!!!!! ------------>
GIORGIO FASSIO-25,000,000
R C STONER-20,400,000


============= NOTES ==================

if you change the sort order, try:

<xsl:sort select="shipname" order="ascending" data-type="text"/>

you will notice that what ever line is FIRST, the format-number function outputs garbage,
but ONLY FOR THE FIRST ITERATION


The XSLT transformation is handled by PHP. Here is a link to my PHPINFO dump for the server in question:

http://c4tx.modwest.com/test.php5


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