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You are comparing scores pulled both times from myFICO, right?
The drop could be a number of factors. If the scores are FICO scores, adding a new account could have initially dropped your score due to the added account, the inquiry if applicable, and a possible drop in your AAoA. Also paid, closed installment accounts, like your auto loan, stop being a part of your mix of credit. If you lack any other installment accounts (SLs, car, mortgage, etc.), then you could have seen a drop from that. ETA...depends on when you pulled the reports for comparison.