AdvancedCollectionView: sorting behavior is not correct

Question

Code example:

class Video
{
    public int id;
    public (int, uint, int, int, int, uint) SortValue { get; set; }
}

ObservableCollection<Video> _screenCollection = new();
AdvancedCollectionView AdvancedCollectionView = new AdvancedCollectionView(_screenCollection);
AdvancedCollectionView.SortDescriptions.Add(new SortDescription("SortValue", SortDirection.Ascending));

for(int i = 1; i < 25; i++)
    _screenCollection.Add(new Video { SortValue = (1, 5, 0, 0, 0, 0), id = i });

//Order is 3,5,7...
AdvancedCollectionView.RefreshSorting();
//Order is 3,4,6
AdvancedCollectionView.RefreshSorting();
//Order is 3,5,7

1. SortValue is same, so I expect the order is same with original collection -> 1,2,3,4,...
2. Why each time calling RefreshSorting(), the order is different.

So in UI, if one field of Video change, instead of just change that video's order, It changes a lot of other videos.