Just discovered several of my listings where the quantity count reverted to the original number available when first listed instead of the actual, current number available after multiple sales. Easy to oversell if you don't catch the glitch.
For example, I just sold the last set of Tommy Bahama Flamingo Bowls I had. The live listing then showed I have 4 available, which was the quantity I had when first listed. I started checking listing quantities and discovered three more incorrect so far.
Always a good idea to keep on top of your inventory.