Happens all the time with shady third-party manufacturers in countries other than your own.

You get a perfectly nice sample unit that meets all specs and looks beautiful. When the container arrives off the boat with 100,000 production units you find materials have been substituted with cheaper materials, scrap plastic, and scavenged components.

Walk into any dollar store and you'll smell something similar to this, cheap plastics off-gassing all kinds of wonderful substances. I picked up a flashlight once that literally smelled of kerosene, probably because that's what the overseas factory used as a plasticizer to get that "rubbery" feel on the handle.