Weirdly exposed roll

I just developed a roll of film and this is how it came out. This is the first time I've seen anything like this, and I'm pretty stumped as to how this happened. This goes through the whole roll without any variation. This is a roll of P30 alpha that I had sitting around. I've been shooting all of my old expired stuff due to film prices, and wanting to get things cleaned up.

Any ideas on what happened here?

I'm as stumped as you are, really.

There was this older thread

https://www.photrio.com/forum/threa...-p30-in-hc-110-or-possible-light-leak.201164/

that may explain something about the P30 exposed film edge, which I suppose could be combined with another different problem maybe during development or a camera light leak.

I'd think that's a problem from the manufacturer.

The odd thing to my eye is that the fogging runs over the opposite sprocket holes. Like it was multiple strips on the master roll. I agree, I don't see any way a camera or tank loading error could have done that (at least, not one roll only in the case of a camera leak).