Problem with the plug WooCommerce Product Variations Swatches

Good morning,
we have a problem with the plug WooCommerce Product Variations Swatches. Attributes are displayed correctly in the product listing, but they are not working. After clicking on a given attribute / variant, and then clicking “Select options” the page redirects to the subpage of the product (not taking into account the selected attribute / variant).
According to the demo, after clicking “Select options”, the “Add to cart” button should appear dynamically. Moreover, after clicking on the product attribute (in the product list), the price does not change dynamically.
All settings in the plug have been made according to the documentation and the movie attached to the documentation.

Regards,