Hello,
Thank you so much purchasing our theme and contacting our support center.
Actually, our theme update can’t remove your configuration saved in Theme Settings. To update the theme properly you need to download the latest version on ThemeForest -> Downloads. Then just reupload new theme via Appearance -> Themes but install this plugin firstly https://wordpress.org/plugins/easy-theme-and-plugin-upgrades/
Also, we suggest you make a backup of all your files before any update.
Kind Regards
XTemos Studio