I wonder if the made a mistake on my card
per USCIS.gov
Skilled workers, new arrivals (E31)
Skilled workers, adjustments (E36)
Professionals with baccalaureate degrees, new arrivals (E32)
Professionals with baccalaureate degrees, adjustments (E37)
Spouses of E31, E32, E36, or E37, new arrivals (E34)
Spouses of E31, E32, E36, or E37, adjustments (E39)
Children of E31, E32, E36, or E37, new arrivals (E35)
Children of E31, E32, E36, or E37, adjustments (E30)
Chinese Student Protection Act (CSPA) principals, adjustments (EC6)
Children of EC6, adjustments (EC8)
Needed unskilled workers, new arrivals (EW3)
Needed unskilled workers, adjustments (EW8)
Spouses of EW3 or EW8, new arrivals (EW4)
Spouses of EW3 or EW8, adjustments (EW9)
Children of EW3 or EW8, new arrivals (EW5)
Children of EW3 or EW8, adjustments (EW0)