Rivian Automotive (RIVN -1.98%) shares are bucking an uptrend in electric vehicle (EV) stocks Monday. There are a couple of reasons for that. While some EV names are riding bullish sentiment on Wall Street, Rivian's shares dropped by as much as 5% in early trading. As of 12:40 p.m. ET, the stock was still down by 2.4% for the day.Rivian is a unique EV makerRivian shares have now dropped by about 30% year to date. The company has some unique features among start-up EV makers, though. In addition to offering ...