At every product card with 2 variant, when one variant is sold out there is a bug.
It is defaulted to the not sold out one by default which is good.
But when user click on the sold-out variant, he is still able to add to cart, it shows as added but does not show at at the cart after all. Pictures linked.
Also while fixing this it would be good to have the product cards showing up in a collection as same sized when one product have longer name. Now it is not same sized. Also added a last screenshot where the product cards in the collection are not the same size because one has shorter name.