with your plugin activated, it’s impossible to select a variation. It’s not possible. This happened in an update of yours 2 months ago. I deactivated the plugin and used the standard selection, which works fine. I just activiated your plugin again, but still the same issue…
My site: www.leinwand-werkstatt.de
Of course at the moment, it’s running without your plugin to not block the shop.
You have a very old version of the premium plugin.
Will you please update it to the latest version?
The latest version is: Variation Swatches for WooCommerce PRO – 1.1.17
You can download the latest version from here: https://getwooplugins.com/my-account/downloads/
Let me know if the problem is solved with the latest version.