Anything wrong in grouping/counting?

I have following script for grouping and
counting.Apology for big chunk of code. Why count is
always count+1 for first row? Am I doing something
wrong?
-----------------------
<xsl:variable name="partlist">
		<xsl:for-each
select="//A[property/@name='PartNumber']">
			<xsl:copy>
				<xsl:copy-of
select="property[@name='PartNumber']/@val"/>
			</xsl:copy>
		</xsl:for-each>
	</xsl:variable>
	<!--Sort PartNumber by @val  -->
		<xsl:variable name="OrderedParts">
			<xsl:for-each select="exslt:node-set($partlist)/*">
				<xsl:sort select="@val"/>
				<xsl:copy-of select="."/>
			</xsl:for-each>
		</xsl:variable>
	<xsl:for-each
select="exslt:node-set($OrderedParts)/*">
		<xsl:variable name="current" select="@val"/>
		<xsl:if test="string(@val) != string(
following-sibling::node()[1]/@val)">
			<xsl:variable name="count"
select="count(preceding-sibling::node()[@val =
$current])+1"/>
			<xsl:variable name="partnumber" select="@val"/>
			<xsl:call-template name="colorTemplate"/>
		
			<td>
				<xsl:value-of select="$count"/>
				
			</td>
		</xsl:if>
	</xsl:for-each>
-------------------
I would appreciate your help.
-Ranjan

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