From a desktop: To re-sync a store registry, log into your myregistry.com account, from your registry's dashboard select Synced Gift List.  

• Under Sync Your Store Wish Lists, click the three dots next to the store you wish to re-sync and select re-sync.
• From a Mobile Device, on the myregistry.com app: Tap Menu and select Things To Do. You will then select the Sync Store Registries option to complete.