Wow. Never seen that before. My first thought would be (if you had not said that this was Regal Shields) was that it was not Regal Shields. This is what none looks like
I would have thought that your plant might be Serendipity or another ALocasia that looks similar
Regal Shields has a kind of a matte leaf, which is due to its Alocasia reginula parentage. Your leaves look more glossy.
If it is truly Regal Shields and was not mislabeled, I say I have no idea...if it might actual it could be normal for that plant. Some do have these unusual morphologies in their leaf structure