The dataExporter component prints out the f:param values that are nested in a commandLink. This causes the output to be repeated or copied to the excel file.

Sample code:

        <ice:form>
            <ice:panelGroup>
                <ice:panelGroup>
                    <ice:dataExporter for="dataExportTable" ignorePagination="true"
                                      label="Download To Excel file" type="excel"
                                      style="text-align:right"
                                      clickToCreateFileText="Click to create Excel file " />
                </ice:panelGroup>
                <ice:panelGroup>
                    <ice:dataTable value="#{testBean.itemList}"
                                   var="item"
                                   id="dataExportTable">
                        <ice:column>
                            <f:facet name="header">
                                <ice:outputText value="Column One"/>
                            </f:facet>
                            <ice:outputText value="#{item.itemOne}"/>
                        </ice:column>
                        <ice:column>
                            <f:facet name="header">
                                <ice:outputText value="Column Two"/>
                            </f:facet>
                            <ice:commandLink value="#{item.itemLink}">
                                <f:param name="link" value="#{item.itemLink}"/>
                            </ice:commandLink>
                        </ice:column>
                    </ice:dataTable>
                </ice:panelGroup>
            </ice:panelGroup>
        </ice:form>