Sometimes Search Engine’s can’t decide which exactly your page matches the search query the best – so they check everything that can give them more clue – titles of your pages, their meta keywords, meta descriptions – everything. However, if two your pages have the same title and same meta description, there is no such clue.

Why it happens?
Blogger has a bad habit to refer to comments through links. Thus Google threats links like these as separate pages (while it is actually simply a link to an anchor on your page).

How bad is it for SEO?

For every comment you have in your blog, Google thinks there exists another page with the same title tag and meta description, thus Google might decide your site is not search-engine-friendly. Google Webmaster Tools doesn’t show you any statistics about your pages that are considered ‘duplicate content’, however numbers of ‘duplicate title tag issues’ and ‘duplicate meta description issues’ might ring a bell and give you the general idea.

How to fix this Issue?

For WordPress users, its very easy to fix this. Go On your Root of Server, create new File i.e robots.txt, Now paste the following lines in it:

Sitemap: http://www.yoursitename.com/sitemap.xml
User-agent: Googlebot
Disallow: /*/trackback
Disallow: /*/feed
Disallow: /*/comments
Disallow: /*?*
Disallow: /*?
Disallow: /*page/*

User-agent: *
Disallow: /cgi-bin/
Disallow: /wp-admin/
Disallow: /wp-includes/
Disallow: /wp-content/plugins/
Disallow: /wp-content/themes/
Disallow: /trackback
Disallow: /comments
Disallow: /feed

NOTE: Replace “http://www.yoursitename.com/sitemap.xml” with your Sitemap Link.