Need help to diagnose product page display issues.

We recently had a contractor build out a customized product page template based on custom metafields. Our site uses the Retina theme.

Since going live, some product pages behave as expected, while others do not. I can’t for the life of me figure out what’s causing the difference in behavior. We use the same page template across everything.

Working As Expected

NOT Working as Expected (The variant options are all grayed out and the image and price do not change when different selections are made.)
-https://www.americanostrichfarms.com/products/moisturizing-lip-balm
-https://www.americanostrichfarms.com/collections/ostrich-eggs/products/ostrich-egg-shells-natural-sheen
-https://www.americanostrichfarms.com/products/pet-sample-packages

Any insights from the community would be much appreciated!