I took this picture in my kitchen about 2 years ago or less. I have no idea how that shadow was produced. I was photographing my Italian dinner, which I thought looked so pretty.
We do have some activity here in the house, it's not common but there is some.
The only light that I have is in the kitchen and is over where I was standing, fluorescent, soft white about 4 long tubes. I think it was daytime out. No one was near me at all. As you can see the shadow is in front of my flash.