It is ok as we check this product from our side
if we select white -> size of ‘XL’ is not shown -> https://gyazo.com/29e2407fad807547395e077e7bb330b6
if we select red -> size of ‘XXL’ is not shown -> https://gyazo.com/b0b86b82e8d18e74097c160dbe51fdb5
It works just like from desktop
Could you please, check from your side and tell us the result of your opinion?
Also, we’ve fixed link in the footer to view amp / not amp version of page.
Regards