Did you purchase it from Apple or a local store, or order it? Not that it matters, but this is something that I might take back to the store and have them look at, if it is convenient.
If you have just received it then you can return it even if nothing is wrong with it, and if this bothers you then my suggestion is that you do that rather than have it be something that you would be unsatisfied with.
Functionally it probably does not matter, but the 12.9 iPad Pro is not cheap, and it should be to your satisfaction.