Hey there,
Sorry you’re having this issue. If you have deactivated the plugin (or deleted it), then it should revert any changes. This plugin uses action hooks within WordPress and without the plugin code there is nothing from the plugin that would change the default behavior. There is nothing stored in your database or on your site after this plugin is deleted.
It is likely a caching issue – either your site’s cache or a server cache. Depending on how your site is setup, you may also need to clear your browser cache (though this seems less likely).
If you have the plugin active, issues related to sliders or broken functionality are often due to another script relying on jQuery being loaded in the head section. There are a couple of options: a) you can globally set “Keep jQuery in the head” via Settings > Scripts to Footer, and/or b) you can selectively deactivate the plugin’s behavior on specific pages via the page editor box.
If you’re more comfortable with code, you can also exclude specific scripts from being moved by this plugin via filters (see the main plugin page for details).
Let me know if you have any other questions/issues!
Thanks,
Joshua