I lived in a house that seemed to be haunted by "doppelgangers"

 

I lived in a house that seemed to be haunted by "doppelgangers." Every event that happened never involved some mysterious figure, but a known person being in a place where they should not have been. Here are a few examples.

• I was a teenager at the time, and I was instant messaging my gf at the time with my webcam turned on. I had the viewer up so that I could see myself in the webcam. Behind me, there was the stairs leading up (left of camera view) and the entrance to the living room (right of camera view). My younger sister would typically fall asleep every night on the couch in front of the TV and make her way up to bed in the middle of the night. At one point in my webcam view, I saw my sister leave the living room and go up the stairs. The thing that struck me as odd was that I didn't hear anything. It was an older Victorian house, so the wooden floor and stairs were loud af. Without saying anything to my gf, I got up and looked into the living room and there was my sister passed out on the couch. I sat back down and asked my gf if she had seen anything in my camera. She said "Yeah, I just saw your sister go upstairs."

• My family was all getting ready to go somewhere. I was sitting in the car with my mom and we were waiting on my sister who was still in the house. After a bit she comes out and gets in the car and just looks at me like "wtf?". I ask her what's wrong and she says that just before she walked out of the house she thought I was still inside so she yelled up the stairs "1LT_0bvious, we're leaving!" and apparently "I" yelled back "Okay I'll be down in a minute!"

Edit: Some more examples since many people have asked. I did put some of these in a response lower but I'll add them here for visibility.

• My mom woke up to someone tapping her foot and she said someone was standing at the end of her bed who "faded out" after a couple seconds. She said it looked like me.

• I had an encounter where I woke up and felt like someone was under my covers laying up against me. When I said something, my blanket visibly deflated and I no longer felt anything. (I include this with Doppelgangers because though I didn't see what I felt under the blanket, it layed like my gf would have layed against me).

• When I was 22 I was in the military and I was diagnosed with type 1 diabetes. It still took like a year after the diagnosis to separate from the military, but I went home on leave for the holidays about a month after the diagnosis. Anyone that has insulin-dependent diabetes typically carries around some sort of kit (mine is black zip-up pouch and it has a glucometer, insulin pen, needles, and alcohol pads). Right after I left home to head back from leave my mom texts me to ask if I'm missing my diabetic kit. I look, and I'm not. She sends me a picture of a diabetic kit and asks if I know it. I've never seen this kit before in my life. Apparently, my sister went into her bedroom and discovered it outside of her window propped up like someone had set it there. Oh, also, her bedroom is on the 2nd floor. Nobody else we know has diabetes.