If you see your slider only if you're logged in as an administrator, and it's not visible for other visitors - in most cases this is due to an old Apache/mod_security version. 

How to check if this is the issue:

Please inspect your page with the browser's inspector and check for the error below in the Console tab:

Uncaught TypeError: undefined is not a function love-it.js?ver=3.9.2:7

How to resolve the issue:

You can ask your hosting company to update the Apache/mod_security.