Resolving "Compare On Hand" Issues

"Why On Hand counts were subtracted twice?"

It looks like you have synced the counts in the middle of the order fulfillment process (after verified on mobile, before fulfilled on Shopify).

 Here is the correct flow (if fulfilled after QC):

1. Create Shopify Order.
2. Submit order to QC
3. Verify(scan) the order on mobile
4. Fulfill Shopify order
5. Sync Compare On Hand counts