This was mentioned on another thread and I just thought of it, I don't know your camera but it was mentioned they with cameras that have leaf shutters, if you exceed the shutter speed, rather than see part of the frame completely black, you get a sort of underexposed center brighter image because the leaf shutter in the lens hasn't finished opening yet. Could this be what happened? Was the shutter speed too fast for the x-sync?
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Could have been but no. It's a Mamiya 645 AFD II (no leaf shutter) correctly put in X-mode. And I had the same problem more or less on the outdoor shots on the rolls I developed myself. But thanks for all the tips. I put it in my mental toolbox for future use!