Product page says "Select the option Above"

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On random product pages on my store, where there supposed to be an 'add to cart button' it says "select the options above' and when you click on variants the add to cart and buy now buttons are unavailable, in order to use the button you would need to refresh the page. How do i stop the 'select the options above'Screenshot 2020-10-15 102835.png

this happens on both pc and mobile