Getting "out of stock" when I'm not using inventory

I’ve been developing my site for a while now. I have had the products piece set and everything was working fine. Today I just went to go through a test purchase and when I add an item to the cart, it gets added, but then after the ajax happens, instead of the add to cart button coming back, it says out of stock. I am not using inventory at all. I even tried to add a new product and it does the same thing. If I refresh the page, I am able to add the item to the cart again, but just the one time.