bhatunoglu on "The posts and other things are gone in home page."

Hello, I have created a website for a client a few months ago :
http://tekstyleankara.com/
The client did something, I don't know what she did but the posts and other things (like categories, calendar, latest comments, social media links at the bottom) are gone.
The other pages look perfectly normal. Like :
http://tekstyleankara.com/hakkimizda/
What could be the problem?
How can I fix it?
Thanks.