Bugs after Adding "Add to Cart" button at the end of product page in Debut Theme

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I tried to add the "add to cart" button with product size and colour selection drop down button at the end of the product page in Debut Theme, but it turns out with bugs.

The products will be only able to add to carts after only when top and bottom select the same size, colour choices. Otherwise the customer cannot add the product to carts. 

How to fix this bug?