The thing is, I don't know when exactly it's happening. It has happened randomly, even if the items in question did not have any sales for the week. I only noticed because I did an item import into our big commerce website, and a CSV is generated containing errors; the error showed "The field 'inventory_level' is invalid" for several items, so I went through each of them and each had one or more variations that were negative inventory. I have only ever seen -1 for the items with the issue.
I looked at the sales history for each item, and they only showed up a few times, but not enough to make inventory go negative. For instance, one item was a hoodie. When I went to look at the inventory levels for it, it showed -1 for Small. However, looking at the sales for the entire year, there was only 1 sold, but we had 2 in stock when I entered them into the system.
I also checked big commerce sales, and it didn't show up in any orders.
As I said, it appears to be happening at random. There really is no rhyme or reason. It just does it to random items at random times, even if we haven't sold any. This also was happening before we got our big commerce website.
