Can you make sure other plugin is not conflicting with revolution slider , you can check this by simply deactivating all plugin except revolution slider. If this doesn’t help please provide us your wp login details so we can see the issue on detail. It will be better if you be on live chat to prevent any further confusion.
Note: 1> We had updated revolution slider so please update your slider to latest version and remove all the custom changes you had made on plugin.
2> Please take a backup of your site before proceeding. Normally we use duplicator plugin to make a backup. https://wordpress.org/plugins/duplicator/.
Here is the video tutorials how to use duplicator and save it to your local computer https://www.youtube.com/watch?v=VdvOGV2eIjE