It's definitely worst on the thin negs
If you've checked and it shows on the negs then it sounds like fogging in camera. What camera? Horizontal shutter? Mirror foam? Too many questions?
It's a Rolleicord VB
Leaf shutter and waist-level finder? Could there be leaks from above, past the glass/mirror?
@mi7rennie started
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If you've checked and it shows on the negs then it sounds like fogging in camera. What camera? Horizontal shutter? Mirror foam? Too many questions?