Refreshing the page makes UserControl to trigger events twice

[Spaier]

For example, there's a ListBox in our view:

            <ListBox ItemsSource="{Binding SomeCollection}">
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="SelectionChanged">
                        <cmd:EventToCommand Command="{Binding SomeCommand,                            
                                                                                      Mode=OneWay}"/>
                    </i:EventTrigger>
                </i:Interaction.Triggers>
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Name}"></TextBlock>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

Before refreshing the page SelectionChanged event is raised one time if we select a new item, but after refreshing the page via F5 selecting the item raises SelectionChanged event twice.