The data for the stock item has not refreshed on the screen.

There isn't a dynamic refresh within Khaos Control Cloud, therefore any changes that are made to a record in a separate tab or window will not be reflected in other open screens. You will either need to reload the page through the browser you are using either the refresh button or pressing F5, or press the reload button on the KCC's record page.  

If you are currently editing the record that needs to be refreshed you will either need to save the changes you are making as it will not retain these when refreshing.