i'm hopeing someone here can tell me what my problem is ...... SOME of my negs are coming out fogged a consistent 3 1/4 inches .... i.e. there is a 5 in by 3/4 strip of normally developed film while the rest is VERY noticably fogged. This has happened in tray processing and tube processing to some, but not all negs in a batch??

I am fairly new to LF but have developed 1000's of MF films in the past and believe that I'm consistent with all steps along the way.

Rather than me continueing to scatch my head over this issue , i'm wondering if i'm missing something obvious, such as bad holders or ????? I DON'T KNOW .... help !!

ken