Right. It is not actually "mis-labeling;" the term was created to describe an assortment of different cory species. If you take a look at the scientific name on the tag, it will actually say "Corydoras spp." A specific species is not mentioned.Any of the plethora of corys that have spots (at all) are labeled as "spotted corys" by Petsmart. You just never know what you'll find in that tank.
My PetSmart usually has black sail and false julii cories in their tank.