Wrong variant is being added to cart on mobile but not desktop (Venture Theme)

[Boneworkwear]

Hi,

I am having an issue where all products on mobile will not add to cart correctly. You can choose the colour/size on the product page, however when it is added to cart it reverts back to the first colour and size small.

please help ASAP.

[Boneworkwear]

Shop is www.boneworkwear.com