Take a look at the below screengrab from the orchestra score of Sweeney Todd.
Are bars 1 and 3 (with the exception of the Bass) tied or slurred? In bar 2 the pitch does drop but in 1 and 3 it's the same notes so if they are tied how would you be able to do an additional upbow for the second bar?
Perhaps they are just phrase markings, or Slurrs. Hard to tell when the Cello does use the same notes.
Audio here https://voca.ro/naw9AvbnqKz