Hi @spinspirit , is tracking quantity option important for you?
If not, fastest way to solve this, without looking closer into the problem, is to uncheck "Track quantity" option for your products/variants.
@spinspirit I'm not completely sure what is the problem you have, since if you have products in stock, you should be able to sell them.
Anyway, if your current problem is that none of the products could be purchased, I suggest that you leave option "Track quantity" checked for products that you really doesn't have in stock, and uncheck for rest of the products.
If you find my answers helpful, please mark resolved or like.