Results of 2 groups through eachother - jasper-reports

Question

I have 2 groups, both will show the same 2 records (from the sql output) but grouped differently and shows different fields.
Output:
The 2nd result of group 1 is between the results of group 2. This is how Jaspersoft works.
But does someone have an idea how to keep the group results with eachother?
Group 1: result 1
Group 1: result 2
Group 2: result 1
Group 2: result 2
Any help or tips are appreciated.
[1]https://i.stack.imgur.com/509cP.jpg
Jrxml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.2.2.final using JasperReports Library version 4.7.0 -->
<!-- 2017-08-11T16:19:29 -->
<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_3" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="a75576f0-e223-4e8a-8d52-67936178ea31">
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="test"/>
<queryString>
<![CDATA[]]>
</queryString>
<field name="from_name" class="java.lang.String"/>
<field name="from_name2" class="java.lang.String"/>
<field name="undgcode" class="java.lang.String"/>
<field name="product_item_id" class="java.lang.String"/>
<group name="Group1">
<groupExpression><![CDATA[$F{product_item_id}]]></groupExpression>
<groupHeader>
<band height="50" splitType="Prevent">
<textField>
<reportElement isPrintRepeatedValues="false" x="40" y="10" width="220" height="30" uuid="ce52a200-b3dd-4b9b-bee4-30cc9db15aa5"/>
<textFieldExpression><![CDATA[$F{from_name}]]></textFieldExpression>
</textField>
</band>
</groupHeader>
</group>
<group name="Group2" keepTogether="true">
<groupExpression><![CDATA[$F{undgcode}]]></groupExpression>
<groupHeader>
<band height="64">
<staticText>
<reportElement x="140" y="10" width="100" height="30" uuid="28d2e565-98d6-4714-8420-81a3819ab46a"/>
<text><![CDATA[Static Text]]></text>
</staticText>
</band>
</groupHeader>
<groupFooter>
<band height="50" splitType="Prevent">
<textField>
<reportElement isPrintRepeatedValues="false" x="40" y="10" width="220" height="30" uuid="857197bd-e4b6-404b-a527-19e63dd02a94">
<property name="com.jaspersoft.studio.unit.x" value="pixel"/>
</reportElement>
<textFieldExpression><![CDATA[$F{from_name2}]]></textFieldExpression>
</textField>
</band>
</groupFooter>
</group>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="79" splitType="Stretch"/>
</title>
<pageHeader>
<band height="35" splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="61" splitType="Stretch"/>
</columnHeader>
<columnFooter>
<band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
<band height="42" splitType="Stretch"/>
</summary>
</jasperReport>