Unwanted Duplicates in DTTG after moving a folder

After moving a folder on my Macbook from a database which uses Bonjour sync to another database which is synced with a Syncstore on Dropbox all folders and all files within the moved folder have been duplicated in DTTG (iPad). On my other two devices (Macbook and iMac) everything is fine.
I am attaching two iPad screenshots, one shows the duplicated folders and the other the duplicated files in one of the folders. Do you have an explanation for this and can you tell me how to set things straight?

Is this just a visual artifact or real duplication? When you quit DEVONthink To Go from the app switcher and relaunch it, are the dupes gone?