Vim - up-down line movements the cursor changes column position

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http://askubuntu.com – While editing a simple text file where every line is nearly to the end of screen, I was expecting vim to retain the column position as I used j and k to move up and down. Surprisingly, it does not happen. I am using a default install of vim on ubuntu 12.10 and a few plugins (unicycle, speeddating, tex, Align, Alignmaps, genutils, html, foldutil, scratch, surround). The behaviour I am referring to is: I am in C57-L5. Line 6 is 80 characters long. I hit j, cursor jumps to C1-L6 instead of C57-L6. What could be wrong? How can I set it right? (HowTos)