Yeah looks like it could be a normal variation in the leather but this would totally bother me every time I saw it bc it's right there, front and center. Can u exchange for another one?? That's what I would do. Too expensive a bag to not be completely happy with it!
I have this exact bag in black and it has the tiniest hint of creasing on the same chevron strip on the back of the bag. I exchanged a different one (larger size) to my current one, in part because of prominent creasing like that on yours. I looked at a number of this design (which is gorgeous, BTW) and given the number of ones with creases, I think it was difficult to fabricate and 'normal' for this design--but that's not a good enough excuse. So totally agree that I'd look for one that looks better and exchange.