The uneveness appears at various places on random negatives. There is no particular pattern. Some are in the middle of the negative, not really an edge factor coming into play. It isn't even a streak pattern, more like patches.

I have not made contact prints or even started to make any prints.

I usually do not print current work for at least 7 or 8 months and even longer. But will make change my patttern to check these out.