Roli does the same thing on their Seaboard Block. The reason for this is modularity – you can put a second unit next to it for additional octaves, where going C-to-C wouldn’t allow that.
But the Morph overlay adds a C, in the bottom-right corner. It works better than you might think. (and you can disable it in the editor, if you are using multiple units)
a spray-on adhesive might also be sound, though I don’t know that I’d go there. I worry about damaging the morph.