Do you have your door integrated with SmartThings? I had a similar thing happen the night before last where our door was open all night, fortunately nothing was stolen. But when I went to check the next day I found that the laser had moved up (likely from vibration of the garage door opener) and so it was reporting back 0% reflection. Because of this my Garadget could only assume the door was open. And then at 10:00 p.m. I have a "Good Night" automation process that closes the door if left open. In this case the door was closed but the sensor reading made it appear the door was in fact open when it was not.
I've readjusted the laser and it is working fine now, but I'm considering putting some hot glue on the Garadget hinge to fix it in place or just go to Home Depot and buy a larger reflective pad to help negate the issue. The Garadget platform is pretty secure so I would look to the more obvious solutions first before assuming your account was hacked. Let us know what you find out with your door.