Qml Windows not displayed in the respective x y coordinates

I am developing a qml application using Qt 5.8 to be deployed on IMX8m evk board the display compositor used is wayland.My qml looks like below

import QtQuick 2.3
import QtQuick.Window 2.2
import QtQuick.Controls 1.4

Window {
id:idParent
visible: true
x:0
y:0
height: 1080
width:1920
flags: Qt.FramelessWindowHint
Window
{
id:idW1
x:0
y:0
flags: Qt.FramelessWindowHint
width:960
height: 1080
color: "red"
visible: true
}

Window
{
id:idW2
flags: Qt.FramelessWindowHint
x:960
y:0
width:960
height: 1080
color: "yellow"
visible: true
}

Component.onCompleted: {
console.log(" width "+Screen.width+ " height "+ Screen.height +" idW1 x "+idW1.x+" idW1.y "+idW1.y+" idW1.height "+ idW1.height +" idW1.Width "+ idW1.width +" idW2 x "+idW2.x+" idW2.y "+idW2.y+" idW2.height "+ idW2.height +" idW1.Width "+ idW1.width)
}

}

The qml is loaded like this

int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

return app.exec();
}
But when I run the app in board neither of the child windows idW1,idW1 are coming in their respective coordinates each time when I restart the app the child window positions changes . The console print shows the x,y as idw1( x:0, y:0) ,idw2 ( x:960, y:0). Application works correctly when I compile and run in Linux desktop
Can any one suggest me solution.