It looks like your workflow is running into an error. Was the workflow running successfully when you created it?
While building workflows that involve trigger nodes (in your case the Shopify Trigger node), you can click on the Execute Workflow button, add a new customer on Shopify, and see the data in the workflow. Once your workflow is ready, you can then change the state of the workflow to Active (by using the switch on the top-right).
Now when your workflow is in the active mode you will not see the incoming data, however, you can check the data from the execution list.
In the screenshot that you shared, after each execution, there’s a Folder icon. If you click on it, you will be able to see the data that got passed and the error message as well.
I hope this explanation helps!