Product Updating Problem

Hey everyone, quick product display question. I have tested two products in my woo commerce store, both with various attributes and combinations. For example, protein powder flavor and difference in weight and size. For this product here, when you click on the different flavor options for the product, it will instantly update to what size is currently available for that specific product:

http://badassbodies.com/product/bsn-syntha-6/

But as for this product, when you try and change the flavor option, the weight option will not update to the available products. If the product is not available, a message will display that says “Sorry that does not exist. Please try another combination” or something like that:

http://badassbodies.com/product/100-gold-standard-whey/

It won’t automatically fix itself like the first product. I can’t figure it out for the life of me. I even copied the first product and changed only the available attributes for the second product, but it stopped it from working.

Any ideas? Any support would be greatly appreciated! Thank you in advance.

-Jeff Arnold