Can a dealer change your income to put a car under your name when you were not the one purchasing?

I purchase a car and my husband was the co-signer. I notice at the dealer they change his income, cause when the papers were brought back my husband income was cross out and another number was written there, and I asked, why was his income cross out and the lady told me "you changed it" I answer no I didn't write that amount and he doesn't make that much. Then I asked the second person and he said ignore that it will change, but I kept thinking about that income change. I'm the owner and they changed my husband income and register the car under my husband if I'm the buyer. I was'n't told anything until I got home and notice that the car wasn't under my name. Then I went to the dealer and they said it right the way it is. how can this be like this if I'm the one who purchase the car and the driver cause he is retired and doesn't drive.They change his income for a reason and didn't say what kind of fraud they were doing to sell the car. We are seniors, but I purchase the car not him.