Why Index pages are getting de-indexed.???

Hello,
My new site have 8 new pages,
And when I submit my sitemap, 7 pages got indexed in Google.
But last few days index pages got de-indexed. Please see the attached SS.
Now only 22 pages are indexed.



What is reason for this?

because of my reasons
Basic reason ( if you are not playing dirty )
1. Check your sitemap , are links correctly added in sitemap ?

2. Do you also use mobile site ? IF yes . Read further
suppose if your main site is lol.abc.com and your mobile site is m.abc.com , If both sites show same content then this could be the reason .
If your desktop site url is ( lol.abc.com ) then Your mobile site url should be m.lol.abc.com or mobile.lol.abc.com etc . This thing is your desktop domain/subdomain should be in mobile site url .

3. Check robots.txt or add robots.txt and allow google crawler

4. Your site has malicious content .

These could be the reason . Once you corrected it ask google to reconsider their decision ,

index on webmaster tools might not be real time, why dont you search site:domain.com and see how many are actually indexed