Try to disable Ajax Product Pagination via Theme options, clear cache, and check how it works then.
If this doesn’t help, try to disable all the third-party plugins (including cache plugins), that does 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.
Let us know the results.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.