It's a minor mostly cosmetic issue. I recently brought up the list of species on my RR char and to my surprise the Doffs had TWO seemingly identical species named "Romulan". I'm really not sure what the difference is. It might be that the game is treating the Romulans from RR branch recruiting as a different species, but.... I'm not really sure.
On a minor side note, I've noticed soemthign similar on the Live server with Vorta. Vorta prisoners are treated as a different species than all other Vorta.