Why would it not be normal? That's far too consistent and uniform to be accidental. Those are stamped in to reinforce the metal. When it's flat it's flexible, but doing that adds strength.
It seems like someone is making these in their garage because he is. He's a single dude that thinks his sh*t don't stink and has been banned from so many groups just because of the lies he slings and the drama he brings. He's who runs the Type R Product Reviews pages too, if you run across...