Simplenotes synchronisation: move note to other section doubles entry

It's the first time I gave Simplenote a try - so maybe I didn't understand how it's working - but I think I found a bug:

If I create a note in a section that is synced and then move this note to a section that is not synced, this note:

 - is not deleted from Simplenote

 - get's synced back to the old section in CintaNotes

which results in a double entry of this note (one in the original section and one in the new section)