Flawed shuffle code - what is wrong with this?

gistfile1.txt

        internal static byte[,] shuffle_order = new byte[,]
        {{0,1,2,3},{0,1,3,2},{0,2,1,3},{0,2,3,1},{0,3,1,2},{0,3,2,1},{1,0,2,3},{1,0,3,2},
        {1,2,0,3},{1,2,3,0},{1,3,0,2},{1,3,2,0},{2,0,1,3},{2,0,3,1},{2,1,0,3},{2,1,3,0},{2,3,0,1},
        {2,3,1,0},{3,0,1,2},{3,0,2,1},{3,1,0,2},{3,1,2,0},{3,2,0,1},{3,2,1,0}};

        internal static byte[,] inv_shuffle_order = new byte[,]
        {{0,1,2,3},{0,1,3,2},{0,2,1,3},{0,3,1,2},{0,2,3,1},{0,3,2,1},{1,0,2,3},{1,0,3,2},{2,0,1,3},
        {3,0,1,2},{2,0,3,1},{3,0,2,1},{1,2,0,3},{1,3,0,2},{2,1,0,3},{3,1,0,2},{2,3,0,1},{3,2,0,1},
        {1,2,3,0},{1,3,2,0},{2,1,3,0},{3,1,2,0},{2,3,1,0},{3,2,1,0}};

        internal static byte[] shuffle(byte[] pkx, bool un)
        {
            byte[] temp = new byte[232];
            Array.Clear(temp, 0, 232);
            uint pv = BitConverter.ToUInt32(pkx, 0);
            uint sv = ((pv & 0x3E000) >> 0xD) % 24;
            const int blocksize = 56;
            if (un)
            {
                Array.Copy(pkx, 8 + (0 * blocksize), temp, 8 + (shuffle_order[sv, 0] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (1 * blocksize), temp, 8 + (shuffle_order[sv, 1] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (2 * blocksize), temp, 8 + (shuffle_order[sv, 2] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (3 * blocksize), temp, 8 + (shuffle_order[sv, 3] * blocksize), blocksize);
            }
            else
            {
                Array.Copy(pkx, 8 + (0 * blocksize), temp, 8 + (inv_shuffle_order[sv, 0] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (1 * blocksize), temp, 8 + (inv_shuffle_order[sv, 1] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (2 * blocksize), temp, 8 + (inv_shuffle_order[sv, 2] * blocksize), blocksize);
                Array.Copy(pkx, 8 + (3 * blocksize), temp, 8 + (inv_shuffle_order[sv, 3] * blocksize), blocksize);
            }
            Array.Copy(temp, 8, pkx, 8, 224);
            return pkx;
        }

I think you've got the offsets in the Copy call swapped.