"Phantom" DropBox images?

Hi everyone,

I'm new here. I did a search for an answer to my question but didn't find anything.

I've got a Motorola Droid, and had DropBox installed. I noticed recently, apparently after uninstalling DropBox, that my gallery has a few DropBox-related folders, each with a small three-arrow circular icon in the lower left corner.

These folders and images don't seem to be anywhere I can find them. I searched for various file names while the phone was connected to my computer, but none that I looked for showed up. I also tried to delete the images from the gallery, but there's no menu option to do that.

I reinstalled the DropBox app to see if I could work with them from there, but they don't show up in the app. I have four such "mystery" folders visible in the gallery, each with photos inside - "Drop Box," two "Desktop" folders, and "New Folder.

Any ideas how to delete these phantom images? I don't even know what the little icons mean.