Files in 'Camera Uploads' folder disappeared

I am using Dropbox on my smartphone and two PCs (one laptop and one desktop). I just found that some of my pictures in the 'Dropbox > Camera Uploads' folder on my laptop disappeared. (The files from Dec 3, 2015)

These files are still in my Dropbox online space, so I can see them on Dropbox.com. Selective Sync for this Camera Uploads folder is 'ON' and the sync is 'up to date.' So the picture from Dec 3, 2015 ~ Jun 3, 2016 should appear in my PC but they can't be seen. I exited and re-started Dropbox and also re-booted my computer, but it didn't help.

My Dropbox account has enough space (34.8GB of 50.4GB used) and my PC has also enough space. (185GB free of 451GB) Inteet connection is also fine.

What would be the problem?

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