It is because you exceed the number of lines that your console is set to display at once.
The property is called
Console.WriteLine(Console.BufferHeight); to see the number of lines your console is set to display at once.
You can change it simply by writing setting it to your desired value, e.g.
Console.BufferHeight = 20000; or changing the settings of the console by accessing the properties in the manner, that @Greg elaborated on.