o for some reason magento is randomly doubling some items. Some times its one item, sometimes its all of them. If we reorder from the admin, it then shows the correct quantity (in this case, 24), but the customer actually ordered and wanted 12. Any ideas where to start?
Have you reviewed the modules in the app/code/local folder?
Since that is not the normal behaviour for Magento, I suggest reviewing the customizations that have been made on the instance.