Wow Morty, you got me on that one.
I stole my wife's Seagrate FreeAgent external USB drive to see about answering your question. It shows up for me in Elyssa as just a single entry labeled 'FreeAgent Drive'.
I would look at the drives folder arrangement in Nautilus. It looks to me that you have multiple folders, one with no following underscore, one with a sigle following undrescore, and the last one with 2 following underscores. Be interesting to see if the folder structure is the same in Nautilus. My guess is it is.