Delaunay Triangles Created Incorrectly

[bnguyenKns]

So I tried to find Delaunay Triangle for a set of 134 points. After getting the list of triangular cells, I tried to plot them on Python, but the result is incorrect. Did I miss something when trying to execute CreateDelaunay()?

private static IEnumerable<DefaultTriangulationCell> DelaunayTriangulation(Dictionary<Point, double> dataForInterpolation)
{
List vertices = new List();
foreach (var item in dataForInterpolation)
{
vertices.Add(new Vertex(item.Key.X, item.Key.Y));
}
var delaunayTriangles = Triangulation.CreateDelaunay<Vertex, DefaultTriangulationCell>(vertices).Cells;
return delaunayTriangles;
}