ListView in a ScrollView append to rollback sometimes

[DavidM29]

Hello,

I do have an issue that does not occurs every times.

I do have implemented a Scrollview and put inside a ListView (I have made it because it is the only way I found to add a Scrollbar on the side of the listview that I can customize with the Qt 5.4)

When I scroll the view inside this I append to have rollback sometimes.
To explain it better I start scrolling until the first quarter of the list for example. Then I scroll until the half and when I release the view goes back to the quarter.

It does not happened every time so I have no idea what is happening.
Does anybody have any idea of what could possibly happened ?

Here is a sample of my ScrollView+ListView :

ScrollView{
        id :view
        anchors.top: spacerTop.bottom
        anchors.bottom: parent.bottom
        anchors.left: parent.left
        anchors.leftMargin: -parent.width/24
        anchors.right: parent.right
        anchors.rightMargin: parent.width/24
        flickableItem.flickableDirection: Flickable.VerticalFlick
        flickableItem.boundsBehavior: Flickable.StopAtBounds
        flickableItem.interactive: true

        style: ScrollViewStyle {
            padding.right: -spacerRight.width/3
            handle: Rectangle {
                implicitWidth: 10
                implicitHeight: 30
                radius: 5
                color: Style.scrollBarColor
            }
            scrollBarBackground: Rectangle {
                implicitWidth: 15
                color: "transparent"
            }
            decrementControl: Rectangle {
                implicitWidth: 0
                implicitHeight: 0

            }
            incrementControl: Rectangle {
                implicitWidth: 0
                implicitHeight: 0
            }
        }
        ListView {
            id: dataView
            clip: true
            spacing : 2
            model: window.model
            delegate: OptionDelegate{}
            interactive: false
        }
    }