Hola @Rhanzes,
¿Podrías revisar que /app/design/frontend/TU_PAQUETE/TU_TEMA/layout/catalogsearch.xml no estés teniendo diferencias en la definición de catalogsearch_result_index y catalogsearch_advanced_index?
Por ejemplo, en RWD, verás la diferencia de layout:
<catalogsearch_result_index translate="label">
<label>Quick Search Form</label>
<reference name="root">
<action method="setTemplate"><template>page/3columns.phtml</template></action>
</reference>
<reference name="left_first">
<block type="catalogsearch/layer" name="catalogsearch.leftnav" after="currency" template="catalog/layer/view.phtml">
<block type="core/text_list" name="catalog.leftnav.state.renderers" as="state_renderers" />
</block>
</reference>
<reference name="content">
<block type="catalogsearch/result" name="search.result" template="catalogsearch/result.phtml">
<block type="catalog/product_list" name="search_result_list" template="catalog/product/list.phtml">
<block type="core/text_list" name="product_list.name.after" as="name.after" />
<block type="core/text_list" name="product_list.after" as="after" />
<block type="catalog/product_list_toolbar" name="product_list_toolbar" template="catalog/product/list/toolbar.phtml">
<block type="page/html_pager" name="product_list_toolbar_pager"/>
</block>
<action method="addColumnCountLayoutDepend"><layout>empty</layout><count>6</count></action>
<action method="addColumnCountLayoutDepend"><layout>one_column</layout><count>5</count></action>
<action method="addColumnCountLayoutDepend"><layout>two_columns_left</layout><count>4</count></action>
<action method="addColumnCountLayoutDepend"><layout>two_columns_right</layout><count>4</count></action>
<action method="addColumnCountLayoutDepend"><layout>three_columns</layout><count>3</count></action>
<action method="setToolbarBlockName"><name>product_list_toolbar</name></action>
</block>
<action method="setListOrders"/>
<action method="setListModes"/>
<action method="setListCollection"/>
</block>
</reference>
</catalogsearch_result_index>
<catalogsearch_advanced_index translate="label">
<label>Advanced Search Form</label>
<!-- Mage_Catalogsearch -->
<reference name="root">
<action method="setTemplate"><template>page/2columns-right.phtml</template></action>
</reference>
<reference name="head">
<action method="setTitle" translate="title" module="catalogsearch"><title>Advanced Search</title></action>
<action method="addItem"><type>js_css</type><name>calendar/calendar-win2k-1.css</name><params/><!--<if/><condition>can_load_calendar_js</condition>--></action>
<action method="addItem"><type>js</type><name>calendar/calendar.js</name><!--<params/><if/><condition>can_load_calendar_js</condition>--></action>
<action method="addItem"><type>js</type><name>calendar/calendar-setup.js</name><!--<params/><if/><condition>can_load_calendar_js</condition>--></action>
</reference>
<reference name="content">
<block type="catalogsearch/advanced_form" name="catalogsearch_advanced_form" template="catalogsearch/advanced/form.phtml"/>
<block type="core/html_calendar" name="html_calendar" as="html_calendar" template="page/js/calendar.phtml"/>
</reference>
</catalogsearch_advanced_index>
Quizás debas fijarte por allí, en tu theme, cómo lo tienes definido.
