How Deepseek Knew My Previous Topic From Chatgpt?

So today, im doing experiments with AI's. As my friend once told me that AI always write garbage stories when prompted. Past 7 months, i wrote stories with the help of Chatgpt because i was curious (Its writing are horrendous, and sometimes it generate an image unprompted). Then, i move to Deepseek, and low behold, Deepseek knew one character's apperances before i describe it. I started fresh with new account of Deepseek, and somehow, it knew one character that Chatgpt help to create. Does Deepseek and Chat