My back up lights come & stay on when I'm parked, especially if I relock the car

What is your question?

I'll lock my Malibu, and then if I have to reopen it to get something, when I relock it, the back up lights come on and stay on. Sometimes, I'm unaware of this and others tell me that my lights are on. I'm afraid that it's depleting my battery if they stay on. Thanks for any feedback. Eileen

What makes this problem better or worse?

Having to open it once it's locked.

How long has your 2012 Chevrolet Malibu had this problem?

Several weeks.