Yoast is adding incorrect structured data

I noticed something strange. Yoast added this tag to my product. However, some of my products are actually used — and it’s causing a mismatch issue in my Google shopping feed.

<meta property=”product:condition” content=”new” />

How did Yoast determine that this product is new versus used? I don’t see anywhere in my store where it could have got that information. How do I change it so it shows “used” for some products?