Hmm, that's a bit odd but I don't think this happens all over the place. My E.B. Games has them sectioned properly, and the people will stop you there and tell you that it's a different console and 3DS games won't work on the DS, etc.
I can't see why your store is doing it that way, unless they have some kind of payment thing and Nintendo didn't feel like paying up for a different shelf. At the end of the day, I imagine a store wants their stock to sell, not sit there, not moving due to consumer confusion.








