If the line is right at the edge of the film, it could be just be fogging from a small light leakage down the edge of the film spool before or after the film was in the camera.

Could be simply that the backing paper was not quite lined up centrally on the spool (hence down one side of the film, with the "blobs" where the leakage was greatest) and/or the film loaded in bright light or allowed to stand in the light for too long.

It used to be a fairly common problem with box-type cameras having simple winding mechanisms, so you may like to check your loading method and the winding on your Rollei just to be sure.