Mac creating randomly named 0kb files

Hi,

I have a new MacBook Pro retina 13 inch. For some reason, every time I modify and save a file, the System (Yosemite) creates these Zero byte files with random names of letters and numbers in the source file.

It's rather unusual, and when I go to delete them, it says they can't be deleted because the source file cannot be found.

I use Dropbox a lot, so I'm thinking maybe it's connected to the way Dropbox interacts with the system files. I'm not sure. Or, maybe it's the system itself.

I attached an example image of what it looks like. The top 3 files are what I'm talking about.

Any advice is appreciated.