On Shopify, you may have product variants that you have told Shopify to track inventory for. For these variants you may also have told Shopify not to allow orders for more product than you have in stock.
If this applies to you, and if your product inventory is inaccurate on Google, then a shopper may order more of an item through Google than is available on Shopify.
When this happens, Shopify will reject the order when Ueblo tries to sync it.
[ Upcoming feature: ]
In an upcoming version, you’ll be able to see these orders inside of the Ueblo app admin, as well as to see the reasons why the orders failed to import and the option to try a re-sync.