Anynomus posts in my website drupal im just new on drupal, i noticed that some posts in my content of my website are submitted by anynomus ( not verified ) user , it came with no type or author . 
is it hacked ?? or how can i stop these posts on my website.
the role at my website required to be verified   before publishing BUT these posts came published already 

plz help here is a screenshot with the black rectangle arround the posts which i mean.
with the Permissions you can deny anything to anonymous (not registered) users you don't want them to do.
Also this may help.