Picture of me and an old man that I never took on my iPad.

So, this has happened to me twice. I have had a picture of an old man in his house with a yellow wall behind him. It seems like a selfie he took, because you can’t see his chin. Another picture of him was in my gallery too. The other time this happened, a picture of my face that I never took was in my gallery too. I know when it could’ve been taken, because I know I had my phone in my hand when it was taken. I never remember taking the picture. I know WhatsApp isn’t the culprit, because I don’t even have WhatsApp. The only messaging app I have is iMessage. This has been really weird. Let me know if you have any possible answers!