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Without having the blade in my hands I cant possibly comment on the cause. To me it doesn't really matter how this happened. As long as the spine to blade width is within the 3.5 to 4:1 ratio, then...

If that part of the edge isn't touching on that side, I would be inclined to get a bit of ware on the spine. I would remove the tape and on a fine hone just see if I get no wear in the middle....

I could be wrong but Ive seen this sort of thing on warped blades.
It usually get ground out though, does the other side have a wider bevel in the middle and a thinner toe/heel?
If its this I would...