A photo I never sent appeared in my KakaoTalk chat

Happy New Year, everyone. A little while ago, after having a late dinner with my family, my youngest son sent a YouTube link for a movie recommendation to our 1-on-1 KakaoTalk chat (9:15 PM). After cleaning up the table, I opened the chatroom, and a photo I never sent had been posted in our conversation (9:28 PM). The photo isn't even in my gallery. I had Siri turned off, so could an AI have overheard our conversation and sent a reply?? My whole family is baffled. What could this be... T_T Attaching the photo. (The photo below of charcoal at a BBQ place is not in my gallery, and since we just ate at home, there's no way I could have taken it.)

AI Translated Image