That's possible, but as strong as these springs are the blade would have had to been very, very close to begin with to squeeze down on the hump in the spring. Have you been letting the spey snap back into the well at all? If you let it snap under full power and it wasn't making contact, that's the only other way you can get that mark. And if you hadn't got it from letting it walk home (erm, hard drag race launch home, lol) you'd really have to put a grip on it to force the blade down that far.
So, maybe?
I've not let the Northfield snap back closed at all on the spey. I noticed that flat spot right out of the tube, so I ride that one home to keep from making it way worse till it gets sharpened back some.
I have done the exact thing you're talking about on a smaller knife in the past, so it is possible.