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No, that is not a glitch. I was told at the seats factory in Fremont (901 Page) where I reserved in person this AM that each person can reserve a maximum of 2 Model 3's per credit card in person. My guess is online as long as one changed the email address each time (so the database primary key is unique for myTesla login) and used a different credit card, one could order many Model 3's.