Viola Theme - Greyed out add to car button when selecting a variant

As titled. Any product on the home page or collection page - as soon as variant is selected the add to cart button is greyed and not clickable. The only way it works is on the actual product page. Any help is appreciated.

collection page & home page- button will grey out when selecting variant.
www.fukuya.ca
https://fukuya.ca/collections/fresh-seasonal-fruits-and-vegetables

Product page - works perfectly
https://fukuya.ca/products/shizuoka-crown-melon?variant=42509457096963

Any help is appreciated. Thanks.

Definitely some bug in the code. I have encountered a few of these add to cart issues recently.

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Best

Shadab