Ok, so my friend developed two rolls of film yesterday, she used my tank, which i know has no light leaks in it. The two rolls were taken one after the other. the roll that was on top in the tank and shot first has two minor light leaks toward the end, the second roll, which was at the bottom of the tank, was nearly destroyed with them, totaling at 14, most of which were severe, and which had no set pattern. Some span multiple frames, and some frames have multiple leaks. My question is, what could be causing this problem. The rolls were opened and loaded into the tank in a light sealed room. The previous two or three rolls were developed perfectly using the same tank. Prior to this, there had been issues with light leaks that were attributed to a damaged tank she'd been using.