Help needed - Blue/Cyan Fringe 4X5 Color Negs

[Peppiniello]

Hi there,
I hope to find help in this super forum. Thanks in advance for the support.

As you could see form the posted images I have an issue with the edges/corners
of some of my 4X5 negs. This is driving me crazy because it feels random:
-I've tested my holders and it doesn't feel related to them
-It doesn't seem to be related to processing either, I've been cross checking with several labs.
-It doesn't look like a light leak
-More strangely, it does not appear on every neg.

I'm wondering if it might be an issue connected to the multi coating of both my lenses:



Any suggestion is welcomed.

cheers