Possible reasons why your don’t see Revolution Slider on frontend of your website are:
- your Revolution Slider element is turned off in Page Builder for page where you don’t see slider
- in case of responsive layout, you can see on the page instead of slider only Alternative Image which is intended to show in place of slider under some specific width of screen. Refer to documentation page related to Revolution Slider Element and make sure your settings for Alternative Image and Responsive Resolution are set per your needs