That could be the result of the manner in which the lender reported the loan.

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The code the lender reports to whatever credit bureau what type of loan it is, might be wrong. 

I work at a credit union and auto loans have codes like 1012222, and if we report code 1021111 it will report as a home equity loan. I wouldn't be concerned about it. But you can always call your lender and ask to verify how its been reported. Or request the credit bureau to send the lender a request to look into the account in detail.