Wrong variant added to the cart

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I have an issue adding a different color than black to the cart on my webshop. You can see an example here: https://www.kien.io/products/2-1-sound-system

When changing the color of the product, the right variant is being added to the url, but when clicking on the add to cart button it's always the black speaker which is added to the cart. Any idea what's going wrong? Strangely enough if I refresh the page before clicking on the add to cart button the right color is being added...

Thanks in advance!