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.