Variation doesn’t display

I’m using this plugin on Sparklestore theme, I added the variation on a product, the variation only loads when the page is being loading, once page finished loading it will just be blank as if nothing as been added. Please how do I rectify this. The link i’m having issue with is https://lukamin.com/index.php/product/mens-cap/. I will really appreciate your help in resolving this.

The page I need help with: [log in to see the link]