Shopping list won’t sync with SmartThings app

When I add an item to the shopping list using the refrigerator, the item will not update on the SmartThings app. The same thing also occurs when I add and item to the app, it doesn’t update on the refrigerator. I’ve already signed out of both the app and the refrigerator to see if it solved the issue but now luck. Any ideas?

Please contact support
support@smartthings.com
or
support@smartthings.co.uk
or open SmartThings app, Menu, Settings, Contact us,