All items being removed from listbox.itemssource

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C#

WPF

ListBox

I have a ListBox that is bound to an ObservableCollection. When I click on the item in the ListBox, I want to remove it from the ListBox, and make another UI element visible based on which ListBoxItem was selected.

At present the method removes all filterItems from the ListBox regardless of what the _selectedItem.ID is equal to. What is strange is that if I add a MessageBox after the end of the Ifs it works correctly.

What I have tried:

Here is my code so far;

private void OnAddToFilterLBSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var _selectedItem = secondListBox.SelectedItem as FilterItem;
    if (_selectedItem != null)
    {
        if (_selectedItem.ID == 1)
        {
            currentItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 2)
        {
            subbieItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 3)
        {
            suppliersItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 4)
        {
            plantHireItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 5)
        {
            architectsItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 6)
        {
            qsItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 7)
        {
            projectManagerItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 8)
        {
            structEngItem.Visibility = Visibility.Visible;
        }
        else if (_selectedItem.ID == 9)
        {
            servEngItem.Visibility = Visibility.Visible;
        }
        filterItems.Remove(_selectedItem);
    }
}