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 cache of browser, and check then. Maybe one of the additional plugins is a reason for the problem.
If you are using child theme, make sure that your custom changes in files are not reason for the issue on Cart page.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.