Hi @Kaila_1 ,
The “inventory quantity changed” trigger starts when a product variant’s inventory is updated either manually, or through the API. So this means when an item is purchased or returned, that still constitutes it as “changed”. So your workflow should add a new row to that spreadsheet every time the inventory is changed, and each row should have the correct updated at time in ISO 8601 format.
If that’s not the case, it might be best to troubleshoot this directly with Shopify Support as they’ll have the ability to look directly into the workflow in question and see what’s going on!