Listview item event multiple events fired

I am using Listview with an observable collection.
But I am getting weird behaviour when I am going from Navigation Page A -> B -> C -> B

Page B listview datetemplate
DATATEMPLATE
<\ListView.ItemTemplate>
<\DataTemplate>
<\ViewCell>
<\StackLayout Orientation="Horizontal" VerticalOptions="FillAndExpand">
<\Label x:Name="Color" BackgroundColor="{Binding ListViewColor}" HorizontalOptions="Start" WidthRequest="10" VerticalOptions="FillAndExpand" Margin="0,3,0,3"/>
<\StackLayout Orientation="Vertical" HorizontalOptions="StartAndExpand">
<\Label x:Name="Title" Text="{Binding ListViewTitle}"/>
<\Label x:Name="GoodsKind" Text="{Binding ListViewGoodsKind}" />
<\Label x:Name="Treatment" Text="{Binding ListViewTreatment}" />
<//StackLayout>
<\Switch x:Name="Switch" IsToggled="{Binding ListViewChecked, Mode=TwoWay}" Toggled="Switch_Toggled" HorizontalOptions="End" />
<//StackLayout>
<//ViewCell>
<//DataTemplate>
<//ListView.ItemTemplate>

PAGE B model from data template
public bool ListViewChecked
{
get
{
return _Checked;
}

        set
        {
            if (this._Checked == value)
            {
                return;
            }
            _Checked = value;

            if (PropertyChanged != null)
            {
                OnPropertyChanged(nameof(ListViewChecked));
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        this.PropertyChanged?.Invoke(this,
          new PropertyChangedEventArgs(propertyName));
    }

Step B
On listview, ItemSelected page C is loaded
but before the Listview Item Selected event is fired the child event is fired
case Switch IsToggled=True
Switch_Toggled is fired before Item Selected event is fired.
case Switch IsToggled=False
switch_toggled is not fired only Item Selected event is fired.

STEP B -> C -> B
I navigate from page B to page C and then back to Page B
case When I click on Switch to enable/disable
Switch IsToggled event is fired three times
Repeat the step B-> C -> B
Switch IsToggled event is fired four times
,............................. and so on

Is this some kind of bug in Listview or am I doing something wrong with my code?