Something Weird

Something weird happened this afternoon when me and our DD entered our apartment. Our electric fireplace was on when I am definitely sure it was off and I haven't turned it since last winter. I was really taken aback. My first instinct was to call my friend from the same complex while I go through every rooms and cabinets in our apartment unit. I checked the doors and windows as well and everything is locked. I am wondering now if it is malfunctioning or somebody really turned it on. It's really scary. I will have to call the office tomorrow and have somebody check it. I will have dark eye circles again for not having enough sleep if this weird thing will not have answer. My friend told me maybe our DD turned it on but it's not possible because she don't know how to open it. When we left I also made sure everything is off. So that leaves me really wondering now.