In dawn theme product page, when I try to click other size it is not allowing me to select the size

Store Design
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I am using Dawn theme where I tried to select another size in product page, but it is not allowing me to select the size. when I click any size it again goes to S size. I’ll attach the error link : https://drive.google.com/file/d/1PXtL2PDqQpPe9Xv3f4ROvNPWxEv5lZnV/view?usp=sharing

Website Link: https://bellandwear.myshopify.com/products/wonderwine?variant=46642178064616

Password: bellandwear