Theme: Multi-Color by Nischal Maniar

Some of my posts are showing up in category page but NOT in the actual posts page. This is happening only for certain posts and i don't find any pattern behind this.

For example:
Here you can see my post is visible in category page:
http://paisafree.com/category/why-to-earn-money-online/

Here it's NOT visible in actual post page:
http://paisafree.com/why-to-earn-online/

Any help to fix this will be highly appreciated.

Thanks