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.