My phone is haunted?

I have an iPhone 6s, and have had two occasions where really weird things have happened to me.
1) I'm in a group chat with about ten friends, I changed the group chat icon to me and my friend from the group chat and it stayed on for like two minutes, I came back onto WhatsApp and it said that I had changed it again to an old picture of me and another friend in that group chat, but then I looked in my camera roll and WhatsApp chats and that picture is no where to be found on my phone…

2) On a different group chat, I had left my phone in my room and went into the kitchen and I came back and apparently I had typed "Hi" but there's no way that that was me. I was alone at home there was no one playing with my phone.

I understand that this could be hacking but its spooky because: my phone was in the car of a car accident I was involved in where the driver had passed away in the car (sounds silly but its spooky) Also I had used the "ghost radar" app many times in the past to contact spirits. I was very skeptical about this all until I started asking questions and was getting responses on an app that does not even have microphone access…

Don't be so effing stupid.

My suggestion, as a computer scientist would be to put your phone in airplane mode until further notice. If the weird things happen again, it's fine something is just messed up with your phone. If not, it could be a sign of hacking and that is much much scarier than a ghost. A hacker will steal your money, identity, and social media. Not to freak you out but being hacked to the point where the hacker has control over your phone is very serious. So put it in airplane mode for 2 - 3 days and don't connect to Wi-Fi or cell! If nothing happens, I'd immediately take it to an Apple store.

I'm just a little skeptical about you having ten friends.