general problems of the 2007 Honda CR-V

I bought a 2007 Honda crv and was almost run over by it today. It appears there might be a defect with the car. I had pulled into my driveway and put the car in park. I left it on so that my 2 year old daughter would have air conditioning while I was unloading the car and putting things in the garage (this process took approx. 5 minutes). I then went to the back seat on the passenger side and got my daughter out of her car seat. I then shut the back door and opened the passenger door to get something out of the passenger seat and grab the car keys which were in the ignition. I took the keys out of the ignition and the car started rolling back wards dragging me with it. . . As I was stuck behind the passenger side door. I was holding the keys in my hand and scrambling to make sure the car was in park. . . It was and the car kept rolling. It eventually stopped after it jumped up on the curb, backed into several trees and hit a street sign. My question is how does this happen when the car is in park? I was holding the keys in my hand as the car was rolling backwards and I doubled check to make sure it was in park as I was getting dragged with the car. Although my leg is now badly bruised and my bumper is messed up; all in all I consider myself to be very lucky. Had my daughter started walking behind the car vs. Walking towards the garage she would have been killed. I'm now terrified of my car. . I also believe that Honda corporate should be notified of this issue to ensure it doesn't happen with someone else and result in a far worse outcome.