photogeek – I assume you have the Photoshop Elements DMG files in your Downloads folder because you previously tried to download Photoshop Elements. And I'm guessing you have two of those because you tried to download it downloaded twice.
Opening a DMG file causes a new volume – for example, to install a piece of software like Photoshop Elements – to temporarily "mount" so you can run the programs on it, like the installer, until you're finished with this volume and "eject" it. Once that's all finished, you can delete the DMG files.
Is it possible that "Untitled" is the (admittedly poorly-named) volume that was mounted when opening one of those DMG files? Can you infer anything by checking the contents of that "Untitled" volume?