Hello,
Looks like you updated the XStore Core plugin but did not update the theme. Before every core plugin update, we would recommend you to check the changelog https://xstore.8theme.com/update-history/ and you’ll find that you need to update not just XStore Core plugin but XStore theme first. Any core plugin update requires the theme update to the latest version before the plugin update.
Follow this article to update the theme – https://xstore.helpscoutdocs.com/article/63-theme-update
Regards