venunath, this has been happening a lot. First time I saw it made no sense and thought that the site was hacked, because I knew the webmaster wasn't that stupid. But then, others might not look at it that closely.
is the new title better? Are users more likely to click on with Google's title? Does it improve the user experience in your opinion, as Google calls it? Does the keyword you mention trigger ads? Can you mention the niche?