Report export A4 landscape XLSX vs PDF (Print)

[chungnva061192]

I use Jasper design and Jasper report 6.5.1 lib for Java.

Why when exporting A4 landscape XLSX is printed in 2 pages, while if the PDF is only 1 page. And the result of 1 page is correct.
I need XLXS 1 page same PDF.
This is my jasper design code:

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.4.3.final using JasperReports Library version 6.4.3  -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="Blank_A4" pageWidth="842" pageHeight="595" orientation="Landscape" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="0a52757b-697e-4ff2-b564-70f6274dc529">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
    <property name="com.jaspersoft.studio.unit." value="pixel"/>
    <property name="com.jaspersoft.studio.unit.pageHeight" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.pageWidth" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.topMargin" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.bottomMargin" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.leftMargin" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.rightMargin" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.columnWidth" value="pixel"/>
    <property name="com.jaspersoft.studio.unit.columnSpacing" value="pixel"/>
    <queryString>
        <![CDATA[]]>
    </queryString>
    <title>
        <band height="79" splitType="Stretch">
            <staticText>
                <reportElement x="310" y="24" width="100" height="30" uuid="bed31327-3646-4218-bc04-1d89c91b4712"/>
                <text><![CDATA[static Text]]></text>
            </staticText>
        </band>
    </title>
</jasperReport>