WooCommerce: Out of stock items should not sell

[Jtrietsch]

I use Square and woocommerce. I do not want out of stock items to sell and go negative inventory. I have woo commerce set to not allow back orders. but I always end up negative inventory. I though it was woocommerce issue but we just sold a item with our point of sale and it was not there. I checked inventory and it showed -1.  it was a variation of the item. as I list New York strip then each steak is listed by weight as a variation. 

[Helen]

As I understand your customers shouldn't be able to place orders from your WooCommerce site for an item that is out of stock.

If you haven't already I suggest you contact WooCommerce's support team and let them know which item was sold (that shouldn't have been) and when, so they can investigate this for you.