The app has a limitation when multiple orders for the same duplicated SKU are placed in quick succession.
1. Say we have order #1001 of SKU ABC for 2 units, making the available inventory count to 55.
2. Now the Duplicate SKU Sync app will update all the items having SKU ABC to 55 units.
3. This takes a few seconds (sometimes a couple of minutes) to update the inventory of all the duplicate SKUs to 55.
4. If a new order #1002 is placed for the same SKU ABC before the app has updated all the duplicate SKUs to 55 units, then there can be an incorrect inventory sync. This is a rare scenario but this is a possibility of incorrect inventory update.