Radio button swatch setting displays a dropdown on product list and product pages

I used to see radio button variants on product list pages and product pages. Recently, the Product Variation Swatches plugin is not working as expected.

https://underlinermaps.com/product/whitefish-montanas-big-mountain-embroidered-champion-sweatshirt/ < example of variant issue.

I currently use the Divi theme, but my premium subscription to Woo Variation Swatches shows a broken dropdown list without color or styling instead of the expected radio buttons displaying variants like color and size.

Please advise me on how to correctly display variation swatches that I know are possible with this plugin.