I had this problem once before but then I thought it was the Paterson Orbital and that the sheet wasn't exposed to the developer beacuse of other sheet. But this time I used a Jobo drum so the problem must be something else.
If it was a light leak from the film holder it shouldn't be ok at the edge.
All help appreciated.
That's been fogged to light somewhere or other, It's not a specific developer issue. Looks like it's happened while in the dark-slide (film holder) as it doesn't run across the top edge but just bleeds into it.
Light leak in the camera. The left edge is OK because it is shadowed but then there is a flare from the left that hits the film. This is likely from the holder not seating properly.
Place a holder in the camera and remove the lens. Put the camera in the sun and look from the lens holder at the film holder inside the bellows.
Thanks, film holder not seating properly make sense. I have a Linhof TK 45, I have to be more carefull the next time at least there is no leaks from the bellow since the other photos are ok.