I can see the all the sections of front page when I am logged in but when I log out all the sections disappear and it only shows a static page which I selected as a front page and the Jumbotron.
Please have a look in the Common issues thread at #3:
To avoid injecting default information as live content, the demo content only serves as guideline to set up your own widgets information.
All the demo content needs to be re-saved/modified/custom/replaced and re-saved to appear on the website while not logged in the Dashboard.
Replacing the missing content with new one will regenerate it on the live website.