Gbonii

I’ve been having these white marks show up on my negatives for a little now, I don’t believe they’re dust because they’re too organized with a pattern. I was thinking maybe from the developing machine but possibly my camera. I’m using a 645n with the 120 back. There are little diamond shapes on the pressure plate but I’m not sure how they’d get transferred to the negative, especially with the paper behind it. Any help would be greatly appreciated