When I did a tour of Case, several years ago now, I was talking to one of the people who did the heat treating. The blade steel comes to them in huge rolls, so, not perfectly flat.
Despite their best efforts, and running it through multiple rollers and heat treating it, every once in a while, internal tension remains.
That sometimes results in a blade slowly warping slightly over time.
It may actually leave the factory looking perfect, then some indeterminate time later, wind up off center.
I bought a yellow handled 6318 years ago (2000?) NIB, and it wound up going on the shelf for a year or two. I took it out one day, opened and closed the blades, and the spay blade struck the liner mid edge, and cut into the liner slightly!! It looked like someone crossing their fingers!!
I had to shove the blade over to close it!
Case fixed it right away, putting in a new blade, and it came back working fine. I was glad I knew why it happened, otherwise I might have despaired of ever buying new knives.
Interestingly, I toured Queen that same weekend, and they were punching blades out of straight lengths of flat stock. They didn't have the big rolls of steel feeding into automatic punching machines. Theirs was very much a hand operation!
Roland, can we see your knife? I know you went through a struggle to get one!