You haven't unticked the the box that states your first line has column headings. In your first screen shot it's ticked.
Thank you.
But if I untick that check box the columns in have defined in the third screen shot are also getting deleted.
And in the last screen shot(the preview mode) is also getting screwed up.
I Need to see the preview mode as it is shown there.
Can that be achieved after unticking that check box?
Thanks in advance
Thank you Thom A. Your guidance along with Lowell's confirmation helped me in fixing the issue