Missing Title Tags in WordPress 4.1

hi
i have a weird problem with my wordpress blog, i published a new post and then i see that the post is different compared to the others, the background and the font color has been changed the the meta title tag was missing

this is the new post

http://www.techno-proo.com/wordpress/must-have-wordpress-plugins/

this is the normal one

http://www.techno-proo.com/tech-tips/things-to-consider-before-buying-a-domain-name/

please help