Please do next tests:
1/ Please check how it works with the default WooCommerce theme – Storefront.
2/ 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.
Let us know the results.
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