There are a few common causes for mismatching inventory quantities between the Source and Destination stores.
The SKUs no longer match
This is caused by either the Source or Destination store changing the SKUs after the initial sync. Syncio uses the SKU to identify which product/variant to update inventory. It is critical that the SKUs are unique per variant and match between stores.
Tip for Destination stores: check the Activity Center to see if any products no longer have SKU matches.
The Source store changed its inventory locations
The Source store chooses which of its locations share stock with each Destination store, from Stores > the pencil icon on the connection > Edit inventory locations.
It can select up to 10 locations, in priority order.
The Destination store sees the combined total of the selected locations.
Saving a change resyncs the synced products to the new quantities.
The location settings are locked for 10 minutes while this runs.
If fewer locations are selected, the Destination store will show a lower quantity. This is expected.
If quantities still don't match after the resync, please contact support. More details in Multi-locations - 2026 Update.
The Destination store changed its receiving location
When the Destination store selects a new receiving location:
Syncio sets the synced products at the old location to 0.
The Source quantities are synced into the new location.
Before you change it: export an inventory CSV if you want a record of the current quantities.
Available only on the Shopify integration