What the heck...

So I run a little daycare and I only have one kiddo today, I run the daycare in the lower portion of our house, so he fell asleep and I went upstairs quick to grab my phone charger, at the top of the stairs I see this(picture) looks like flour. I touched it to see if it was like drywall or something and looked around but there's no drywall missing or anything like that. There are no footprints leading to it, just looks like someone dropped flour on the floor. I have not used any flour today, and it was not there this morning... Explain that?! Anyone that says spirits aren't real should stay a week at our house... We hear doors squeaking, foot steps, sometimes quiet voices, toys randomly turning on, things moved, tv turned on, random stuff like that. I've never had anything as weird as this random flour on the floor though, kinda freaky! Also-- the spots in it where it looks like prints is just from me touching it.