Woocommerce: quantity not showing for variable product

Hello,

I’m having trouble figuring out why my quantity input is not showing for variables products on Woocommerce. After I choose a size for the product the ‘Add to Cart’ button shows but the quantity input doesn’t. If I inspect the webpage using Chrome I can see that the following:
<div class="quantity buttons_added" style="display: none;"><input type="button" value="-" class="minus"><input type="number" step="1" min="1" name="quantity" value="1" title="Qty" class="input-text qty text" size="4"><input type="button" value="+" class="plus"></div>

I’m not sure where the "display:none" attribute is coming from. Any suggestions on resolving this. I’m not getting any errors thrown in the console, either.

(I have this hosted locally so I’m not able to provide a link to the webpage)