Top Cast with extra character names

Recently under 'Top Cast' many characters are followed with /[another character]. Typically this is for a character that plays two parts i.e. Tom/Protestor. It seems tho, extra characters are being added that the main character did not play. For example; in JAG (1995–2005) the following characters (below) are the top 13 in the list. It is rare that a top character poses as two characters. In the list, the first actor David Elliott shows in his personal listing as only have played Harmon Rabb in JAG so, why is that character followed by /Young Lt. Ron Graham? And Catherine Bell certainly did not play a second character in this series. Seeing this is across many unrelated TV series... this almost seems like there was a database mistake and that many, if not all, of the listings are corrupted. Or, maybe there is a simple answer - inquiring minds would like to know ;) David James Elliott ... Harmon Rabb, Jr./Young Lt. Ron Graham Patrick Labyorteaux ... Bud Roberts, Jr./Cmdr. Rayburn - Doctor Catherine Bell ... Sarah MacKenzie/Ens. Beverly Trombatore John M. Jackson ... A.J. Chegwidden/CPO Burns Karri Turner ... Lt. Harriet Sims/Ens. Harriet Sims Chuck Carrington ... Petty Officer Second Class Jason Tiner Scott Lawrence ... Sturgis Turner/Seaman Thomas Zoe McLellan ... Jennifer Coates/Ens. Jane Connors Randy Vasquez ... Gunnery Sgt. Victor 'Gunny' Galindez/Lt. Garcia Trevor Goddard ... Lt. Cmdr. Mic Brumby/Cmdr. Alexander MacKenzie Steven Culp ... Special Agent Clayton Webb/George Griffen ... Nanci Chambers ... Lt. Loren Singer/Jo Jo Paul Collins ... SecNav Alexander Nelson/Mort Reese