Hello,
1/ Already answered. Check the comments section of the plugin – https://codecanyon.net/item/woocommerce-dynamic-pricing-discounts/7119279/comments?utf8=%E2%9C%93&term=String.fromCharCode&from_buyers_and_authors_only=0&order_by=relevance 2/ 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. Let us know the result
Regards
