I've had my leica m6 since 2007 and never experienced any problems with light leaks on my 35mm scans.
Recently, I shot 5 rolls of Fuji 400H. 2 of the rolls came back with some very subtle light leaks. At first glance I thought it may have been a scanning problem or chemical residue. However, upon reviewing the film, I was clearly able to see the same leaks/haze on the left hand side of the film, running top to bottom. I'm wondering if A) is this caused by my camera or B) store developing process. I've attached sample images for reference.
Would be very happy to know your thoughts.