Hello,
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.
OR
add the next code in Theme options > Theme custom CSS:
.products-loop .woocommerce-product-details__short-description {
display: none !important;
}
Regards