System.Numerics glitch?

Program.cs

using System;
using System.Numerics;
using System.Security.Cryptography;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            RNGCryptoServiceProvider rnd = new RNGCryptoServiceProvider();
            byte[] data = new byte[4];
            rnd.GetBytes(data);
            BigInteger int1 = new BigInteger(data);
            rnd.GetBytes(data);
            Console.WriteLine();
            BigInteger int2 = new BigInteger(data);
            int1.WriteToConsole();
            Console.WriteLine();
            int2.WriteToConsole();
            Console.WriteLine();
            Console.WriteLine("--------");
            BigInteger int3 = int1 ^ int2; // works dandy
            int3.WriteToConsole();
            Console.WriteLine();
            Console.WriteLine();

            int3.WriteToConsole();
            Console.WriteLine(" ==");
            (int3 << 1).WriteToConsole(); // kinda screwy
            Console.WriteLine(" <<");
            (int3 >> 1).WriteToConsole(); // works more often, but still screwy
            Console.WriteLine(" >>");
            Console.ReadKey();
        }
    }
    public static class Extensions
    {
        public static void WriteToConsole(this BigInteger bigNumber)
        {
            string numString = bigNumber.ToString("x");
            for (int i = 0; i < 8; i++)
            {
                if (numString.Length >= 8) //just to make sure I'm not going insane...
                {
                    break;
                }
                else
                {
                    numString = string.Concat("0", numString);
                }
            }
            Console.Write(numString);
            Console.Write(" ");
            foreach (byte b in (bigNumber << 1).ToByteArray())
            {
                Console.Write(Convert.ToString(b, 2).PadLeft(8, '0'));
            }
        }
    }
}