Old entries are not updating when profile is updated

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At beginning I wrote my screen name as chankey then after answering the first question I changed it to Chankey. Now when I see my site I see that older entry was not updated with the new name. It's correct inside the question page, but on the homepage it is not coming correct (showing old screen name).

Also I changed the flag option later. It is also not appearing for old posts. You can check it on my code site.