Well, its an increase in density so its either light leaks or chemical fog--atmospheric conditions would not cause this type of defect.
Can you scan and post the entire negative, including the edges. I think that the only reason you don't see the effect in the shadow area is only because of the increased density in the print in those areas. How did you print these--what is it that you scanned and posted?
I have used the Combi Plan tanks extensively in the past, not as daylight tanks but as a series of small "deep tanks" and I don't see how you can get negatives with these kind of defects and two or three others in the same rack that are perfect. Are you sure that the others are perfect? How are you continuing the processing after the development stage? Are you taking the film out of the rack and putting it into the stop as a stack of film?
Have you considered Light leaks, a fogged box of film?
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