Since you have not so many Photos uploaded yet could you try to trigger "Delete Data" via the Lightroom Preferences->Lightroom Mobile. Thereafter re-sign-in and syc those photos again.
If that won't help please send me a LR Desktop diagnostig log - best as a private message with a downloadable dropbox link.
You can trigger the log via LR Desktop prefereneces -> Lightroom Mobile and when you hold down the alt key you will notice a generate diagnostic log button.
Thanks alot! "Deleting Data" has helped.