This issue is caused by the Shopoo Fulfillment location not being including in your shipping rates due to multiple shipping rates. To resolve this, go to Settings > Shipping and delivery from your Shopify dashboard. From the Shipping and delivery page, select Manage rates on your default Shipping profile. Scroll down to the bottom of the page to find the Not shipping from list and select Add rates next to the Shopoo Fulfillment location. You can set new rates for Shopoo’s products based on what you deem feasible for your store. Don’t forget to repeat these steps for any custom shipping profiles in your Shopify store.