Size Label Swatches Cannot Be Clicked or Selected

Hello. I love this plugin, but after setting up the attributes for choosing sizes, then configuring the terms (Small, Medium, Large, etc) I added the attributes and variations to my product listing, but you cannot select any of the sizes.

When you click any of the sizes nothing happens. I would think it would highlight the box to let the user know they have selected the correct size, but nothing happens.

I’m using Elegant Themes DIVI theme. Any help is appreciated!