Hello, @gayatri,
First of all, you are using a very old version of the theme and plugin.
You have to update the theme to the very latest version and also the plugins as well, you can follow this doc: https://xstore.helpscoutdocs.com/article/63-theme-update https://xstore.helpscoutdocs.com/article/37-plugins-update
And then Please try to disable all the third-party plugins (including cache plugins), that do not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear the cache of the browser, and check then. Maybe one of the additional plugins is the reason for the problem.
And if the issue will still persists then please remain all the third-party plugins deactivated on your site and provide me the permission to debug your site which includes deactivating all the third-party plugins and on-site Customization as well so that I will check and assist you accordingly.
Note: Please take the complete backup of your site first.
Regards 8Themes Team.