Cannot add items to basket when this plugin is active

I run WooCommerce off my website as standard, and the basket works fine. The floating basket, however, as of the last week, seems to not add anything to the bask, so if I add an item, then view basket, nothing is there.

The only way I could fix it (and I updated it this morning to check if it has been fixed, it has not) was to turn this plugin off. Are you aware of this bug yet? If not, let me know if you need any other information from me. I like the plugin, but it’s not working properly on my website, and I run a pretty simple, WooCommerce focused website.