Camera [Q] Photos mysteriously disappear from gallery

I am currently running the latest kitkat version but have had the problem with previous version of Android as well. Every so often, I will go into my gallery, and all the pictures in the camera folder are gone. The other galleries are fine, it is just the location where the phone stores photos taken with the phone. I use a file manager and the folder is empty. I hook it up to the computer and still nothing. I save files to the internal memory, not SD card. I have dropbox set up to sync my photos. I don't see any setting which would delete the photos after they are synced, and even if there was such a setting the photos would be missing on a daily basis which they aren't. Luckily dropbox has been syncing so I haven't lost anything but it is pretty damn annoying. Any clue on this weirdness?