Странное поведение Доски объявления!

Тогда вам нужно создать узел структуры сайта с типом "динамическая страница"

Вероятно нужны будут еще правки в самом xsl шаблоне.

Вы показ в макете убрали?  В макете указано Core_Page::instance()->execute(); чтобы динамическая страница выполнялась?

<!-- Filter String -->
<xsl:variable name="filter"><xsl:if test="/shop/filter/node()">?filter=1&amp;sorting=<xsl:value-of select="/shop/sorting"/>&amp;price_from=<xsl:value-of select="/shop/price_from"/>&amp;price_to=<xsl:value-of select="/shop/price_to"/><xsl:for-each select="/shop/*"><xsl:if test="starts-with(name(), 'property_'">&amp;<xsl:value-of select="name()"/>[]=<xsl:value-of select="."/></xsl:if></xsl:for-each></xsl:if></xsl:variable>
      
<xsl:variable name="on_page"><xsl:if test="/shop/on_page/node() and /shop/on_page > 0"><xsl:choose><xsl:when test="/shop/filter/node()">&amp;</xsl:when><xsl:otherwise>?</xsl:otherwise></xsl:choose>on_page=<xsl:value-of select="/shop/on_page"/></xsl:if></xsl:variable>
      
      <xsl:if test="$items_count &gt; $limit and ($page + $post_count_page + 1) &gt; $i">
         <!-- Store in the variable $group ID of the current group -->
         <xsl:variable name="group" select="/shop/group"/>
         
         <!-- Tag Path -->
      <xsl:variable name="tag_path"><xsl:if test="count(/shop/tag) != 0">tag/<xsl:value-of select="/shop/tag/urlencode"/>/</xsl:if></xsl:variable>
         
         <!-- Compare Product Path -->
      <xsl:variable name="shop_producer_path"><xsl:if test="count(/shop/shop_producer)">producer-<xsl:value-of select="/shop/shop_producer/@id"/>/</xsl:if></xsl:variable>
         
         <!-- Choose Group Path -->
<xsl:variable name="group_link"><xsl:choose><xsl:when test="$group != 0"><xsl:value-of select="/shop//shop_group[@id=$group]/url"/></xsl:when><xsl:otherwise><xsl:value-of select="/shop/url"/></xsl:otherwise></xsl:choose></xsl:variable>