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Welcome to the forum. If you have a short credit history and your util was high on the loan, that could be responsible for the drop. has the PIF been reported on your CR yet? Also how many other CCs are reporting a balance. Remember that even if you PIF, the reported balance is what effects your credit score. FICO doesn't care if you PIF each month.
Does the loan show a $0 balance on your credit report?
Maybe something else happened in addition to the loan, but new credit is a score-killer. On average I have lost 20-25 points with each new TL reporting. Last summer, I lost over 50 when I added a new Penfed, Amex, and Discover. The new credit hurt and I was rebucketed due to the new credit. Most of those points came back over time, approx. 6 months and I noticed large increases around the 10 month mark (I think I was rebucketed back). In general, most, if not all, of the points return by 12 months.
OP, is your score from myFICO and which one?